<human>: My mother has been hounding me the past day about inviting my sister's bf to christmas eve (it's at my house and my mom currently lives with me) My sister lives with her bf and his family.

My sister hasn't really said anything to me and I told her my views earlier today.

The reason I don't want him to is about 2 months ago we found out they got into a fight and he hit her and she pushed him. A week later she is kicked out of his familys house and moves into mine for about a month (rent free helped out a little) then moves back into his after they patched it up (This has happened before they have been on and off again and lived together off and on too)

I don't want to deal with it on christmas eve. I don't have a gift for him nor do I really want to go get one. He didn't go to my dads christmas (but apparently there was other stuff to that too). I want a more drama free evening. 

My mom went over to my sisters earlier and apparently she cried to her about him not being able to come. He wants to prove himself I said he can but not on christmas eve we'll try another day. 

My mom is worried that my sis won't come to christmas eve over this and part of me doesn't care I hate bending over when it comes to family stuff with my mom, especially when it deals with who I want in my house.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Mom and sister upset I won't let sis bf come to christmas eve due to drama that occured 2 months ago.