My mom wants me to stay at her house and

So here’s a quick backstory;

My mom has custody of her grandchildren. My sister does drugs and lost them

Schools are letting out for summer break and she has no one to watch the kids. She thinks that I am going to stay in my room there and watch the kids but the problem is I have 4 kids

I am also going through some problems with my husband and my mental health isn’t the greatest which impacts me being the greatest mom. I’m doing the best I can but it’ll be too much for me watching 7 kids. (2 babies… my baby is 9 months and the other is 1 yr)

Her and my step dad works but they are going through their own battles and don’t have much money so my mom isn’t going to pay me. It’s basically 6 days a week.

I love sleep and so does my kids. We wake up at 10 am and my niece and nephews wake up at 6 am sometimes even 5 am and that is too early for me 😭

I love my mom but don’t know how to tell her this is too much for me…

Also, I wouldn’t be able to go nowhere or have a vacation in Guatemala like I planned with my husbands family.

I know my mom shouldn’t have to worry about raising her grandkids, it sucks but I don’t know what to do… I also never have help with my kids which sucks just as bad.