How long to allow sister and her baby live with me?

Samantha • I am me.
So my 19 yr old sister is living with me with her 11 month old and they've been with me for only 2 maybe 3 weeks and I'm already regretting it. Today she said she would watch my son who's 1 and a half so I could go to school and my fiancée could work but when my fiancée got home my son has poop down his legs and it was crusted in his diaper and now has a rash, he hasn't had a rash since he was an infant!!! I'm trying to help but her and her daughter just scream all day and night and also destroy my house the problem is she has no where else to go she doesn't talk to her mom and our father is not a dad. She has no diploma no GED and no job she has nothing and i just found out I'm about 4-5 weeks pregnant and my bf wants her gone before our lease ends because we are moving into a house and I kind of want her gone before baby arrives but since she has absolutely nothing idk what to do!! She's not very helpful and has been nothing but a Debbie down and a negative Nancy it's annoying!! HELP!!! I don't know what to do!!!

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