Okay so I have been dating my boyfriend for 4 1/2 years now and we plan on getting married after I graduate school.  He is the oldest of 7 kids and takes on the 'big brother' role.  My boyfriend, we'll call him B, has asked me to let his brother move in with us again and I don't want him to.  Here's the backstory.

&amp;#x200B;

In the 4 1/2 years of us being together, we have had 3 siblings live with us.  Sibling 1 lived with us for 6 months.  Sibling 2 lived with us for 8 months, got kicked out, he talked me into letting her come back and she stayed another 6 months.  Sibling 3 stayed with us for 4 months and was doing his parole with us, is back in prison now and is wanting to complete his house arrest/parole with us.  Last time sibling 3 stayed with us it was horrible for me- he was manipulative, lying, had no respect for our property and even tried to break B and I up, broke all the house rules, tried sneaking in his gfs all the time...etc.  It was an awful situation for everyone, it was always a fight with him and it seemed never-ending.  Now B says that he feels bad for me and how I was feeling during that time and swears this time will be different and he'll put his foot down etc etc- but I have a pretty good understanding of his personality by now- Sibling 3 is the way he is and I don't feel like having to parent a grown man (he's 28)  just so he doesn't throw a temper tantrum. Countless instances have happened and I do not feel the need to list every single one. 

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Whenever I bring up that I would be miserable with him living there B says that yeah it's awful but no one else will take him, since he burned bridges with everyone, and I don't understand because I am not from a big family.  Then he goes on to say that he would feel responsible if he went back to jail and someone needs to look after him.

&amp;#x200B;

I am about to graduate next year and would love to have a life with just me and B, without his siblings living there and the headache that they bring.

&amp;#x200B;

AITA for wanting to say that he's grown and responsible for his own actions/life?  