In law struggles, Help!

I never really had a problem with my unlaws. They're very different to my family however there where never any arguments until i had my baby then it changed. I'm very protective of my baby as anybody would be, i don't want anybody else to have him. I trust my mum to have him however i live with her so it's different she's had him over night a few times but i'm in the next room so i can hear him and see him still but she's just given me a night off every few weeks to catch up on sleep. I also have a very close friend who is trust with my baby, she's not had him at all yet not even for an hour but i have asked her to have him in a month or so when he'll be nearly 6 months so i can go for a family evening out for a birthday celebration that my mum is attending. The problem is my mother in law is an active drug user, i don't judge i know it can be hard once in the depths of addiction to stop but I do not trust her with my son not even for an hour, people say she's had grand children she's never used with the grand children there but that's what SHE says nobody can say whether she has or hasn't only she knows and ofc she'd say she hasn't, it was also different as when she had the other grand children as babies my partner and his sister lived there so there was someone else constantly there when the baby was there but now she lives on her own so if she was to use and something happened she'd be on her own. She also smokes cigs in the house which we do not our house is strictly a smoke free home and if anybody holds the baby they have to wash their hands take off the top layer of clothing and not touch baby until atleast 20 mins after smoking even after doing all of the above, i worry that if she had him and she wanted to smoke she'd either smoke in the house or leave him on his own to have a cig as smoking is also an addiction and i know she couldn't go a whole few hours without smoking never mind over night and he's never left on his own at all when he's with me he's constantly with somebody. I feel uncomfortable him going up to the house for visits purely because of the people that go there, the fact it isn't a none smoking home and the fact that people actively take different drugs within the house. This is causing problems because i always make excuses for baby to not go up but there's only so many i can say so he has has to go up a couple of times and the whole time im on edge. Im being told that i shouldn't let my friend have the baby before my partners mum or sister has him but i dont trust any of them his sister drinks a lot especially on weekends and has a child that's very heavy handed with babies and can kick off a lot i dont want that around my son if he kicks off id be scared for his safety its different when he comes to my house to visit baby as im there aswell as his mum( partners sister) so i can focus on baby while his mum sorts him out however if something was to kick off if partners sister had my son then she'd have to not focus on baby or try and sort her son while holding my child etc and it could end bad i could be thinking too much into it but im just so scared i want to protect him with my life. I try and put this across but nobody listens as the friend i trust with my baby also has a child but her child is very calm he's been around my baby since the day he was born he loves him he strokes his head so softly gives him cuddles and then goes and does his own thing he never kicks off he's a very well behaved child with no jealousy etc showing at all and always asks for sleepovers with baby i know he'd be safe at my friends house but i don't think he would be at my in-laws. There's alos another problem, i don't want my son going to their house due to the drug use etc but i also don't feel comfortable with them coming to my home often either. When i first had my baby my partners sister was quite nasty to me a few days postpartum she screamed at me and kicked off i went home and cried because of the hurtful things she said for a few days straight i couldn't shake what she said and couldn't shake the hurt she made me feel at all i still get upset about it now she's younger than me very naive and is going down the same path her mum is on atm she uses recreational party drugs a few times a week drinks a lot and sees random men often she isn't a very nice girl i have tried to offer her support in the past offering her a place to live to be closer to baby etc but she didn't take it and just seems to be getting worse and worse. I didn't speak to her and blocked her for a while after this happened but in the end unblocked her for the sake of my son and partner however a few weeks ago something else happened with me and my partner she got involved called me nasty names said i was delusional and said i must be struggling with some sort of psychosis because of how i felt which i know i wasn't but she was awful i told her if she can treat the mother of her nephew like that she doesn't deserve access to her nephew and removed her again. After the first incident her mum also obviously got involved and tried to make lied up to make me look like the bad guy which a few people had my back on and said what she was saying was lied. After my mum seen me in a state she said she doesn't want these people in her house anymore which i agreed to and said that for a few months they can see my baby in a place that's mutual maybe at another family members house or even their house but not often so he isn't open to the things they do in that house. Since then we've said they can come see him just so i can see what's going on with my son and he doesn't have to leave my side if i don't want him to but they just won't make the effort to. Now my partners sister keeps texting me asking when she can see baby when we're taking him to her mums when we are taking him to his dads who is also an active drug user and has horrible people in the house which again i don't want my son around. I keep making excuses but then i get nasty replies. Most of the time they aren't excuses if the weathers bad i don't want him being taken out to go there in the pram which it has been slot recently. He also had hos jabs so was poorly when they asked us to take him up so i said no, i recently washed his pram inserts and they're air drying so when they asked recently i said no his prams drying but they said we should just carry him or pay for a taxi to their house and back but i am the only one working atm as my partner lost his job i dont want to pay £6/£7 each way in a taxi when jk struggling with money as it is with christmas and birthdays of family members coming up so again i said no. I've said they can come here but it's not good enough. I keep getting accused of keeping him away from them which part of me feels like i am doing but his safety is my number 1 priority. Like i said i was brought up so different to them i never went without a meal my parents aren't drug users they barely drink and never did when i was young my family always came to us when we where children especially grandparents and i spent all my time at home i never had sleepovers at family members houses it wasn't necessary for a relationships as relationships can be built in the day time not just during the night when babies sleeping anyway. Another thing is that his mum always wants to feed baby she would get angry when he was first born that we didn't wait to see her to give him a bottle cos she wanted to feed him one time she took him off me to feed him and when i asked for him back she said no cos he's her grandson so she gets to feed him too. Another time we was at a family party he was only a few weeks old and he has been passed around which i said i didn't want to happen but felt too guilty to say anything as it wasn't my family to say it to, his auntie was holding him he started crying i went to take him but my partners mum pushed past and took him and said 'come to granny you are safe with me i'll sort u our' but i knew she'd been using i didn't want her to hold him and it's also my responsibility to calm him and be his safe place not hers. There just been problem after problem and i need help