What?! My 19 year old sister is getting married to a jerk!?

Sorry about the title, haha. Anyways, my 19 year old sister just broke the news yesterday that she is getting MARRIED…NEXT TUESDAY! to her as*hole of a boyfriend who’s 18

We have had some rough times with them being together, he is immature and a jerk. But there has to be a reason why she loves him. She got kicked out of the house about 2 months ago and she’s been living with her boyfriend ever since. And since he’s going to be leaving for the military soon, they figured it would be a good idea to get married now so she will get benefits from him being in the service.

When my mom told me, she also told me that my sister wanted me to be her maid of honor. I started crying. It’s going to be the biggest thing I’ve ever done for someone, not to mention because it’s my sister. My mom is taking it extremely hard, she’s been in bed crying all day. And I can understand because I know she doesn’t want to give her daughter up to somebody that she doesn’t like, and doesn’t trust. I still don’t know what to feel about it, because it’s my sister. And I want to be happy for her.

Any thoughts? My family’s crazy.