Hey everyone,

So my boyfriend found out last June about a half sister who is 2 years older than him that he never knew about. They started hanging out and now have a good relationship. My bf's sister who is 3 years younger than him doesn't know about her yet.

The dad never told either kids about her and all the child support, cell phone bills and car payments for the older daughter went through his business so my bf's mom doesn't know, either.

My boyfriend really wants to tell his younger sister, but doesn't know how to go about doing it. He doesn't know how she'll react or anything. She just got engaged, and he feels like the older sister missed out on so much of their lives that she should be involved in this, or at least be at the wedding.

I worry about how the mom is going to take it, because if she doesn't know I worry about their marriage, but that's just me.

Any suggestions?