My boyfriend just found out he has another sister. She is 26, so she's about a year and a half or 2 years older than my boyfriend. Anyway, my boyfriend's mom doesn't know about her, only his dad does and he is really confused.

She told him not to tell his dad that he knows about her now.

He's contemplating talking to his uncle about what he should do, maybe his uncle knows something about her.

This is the first time he's heard of her. His dad has 3 other kids from previous relationships, and then my boyfriend and his sister in this current marriage, and now this sister that he just found out about.

He contemplated telling his mom but he thinks it would hurt her because she doesn't know, and he thinks she's leave and his dad is old (77) and can't take care of himself.

So he's wondering what he should do about the situation. He's meeting her on Saturday.

Any advice would help soooo much!

Thanks!

He should respect his dad's wishes and not say a word.
After 26 years plus 9 months from her conception, of them being happy together why crush mom and ruin what they do have now. At their age they need each other and nothing in the past should matter enough to bring it up and possibly destroy the remaining years they do have together. What good could possibly be gained by it by now. 26 years ago I might have said tell her but she went 26 years without knowing -so why now?