Am I wrong or am I right?

So my mom & my siblings have been living w us for about 1.5yrs. She was getting kicked out with no where to go. So me & my husband been convinced her to stay w us for the sake of the kids. So it’s her, 3kids, and her bf (who hasn’t worked since hes been living w us) For the first year, she paid us $500. When her bf got a job he quit after 3mths. When he was working he paid us $300. So in total they were suppose to pay us $800. According to my mom, that was too much. After he quit and being a year we told her she had to pay $650. So keep in mind, they both don’t help buy groceries, bills, or help around the house. So yesterday we got into because I asked her when she was going to the grocery store to get food. She asks me why. I told her because the kids eat up all of my daughter’s fruits & my husband’s snacks. And the only reason why I let them is because their mother hasn’t went to the store for almost a mth to get them food to eat. I cook dinner every night but when they get home from school they’re hungry. So anyways we get into it and she says what she pays is enough and that $100 she gave us two weeks ago was enough for us to buy food( we spend about $250/wk on groceries and $500/mth on meat) usually that meat will last us about 3ths, but w them here, it lasts barely a mth. And I told her instead of budgeting for food, she spends it on weed or food for her. Next day she sends me a text that her & her bf are supposedly moving out at the end of the mth. But she asked if the kids could stay here w us. Which I said yes. My husband thinks she should pay $350 for the kids to stay here. Personally I wouldn’t charge for the kids since this is nothing new to me. The less I gotta deal w her financially the better bc it ends up w stress and disappointment. My husband says other wise. So my question is, should I agree w my husband & charge her $350 or should I just let the kids stay w us no charge or just have them not stay w us at all?