Her boyfriend is 21 and she’s 32

My sister been dating this man for a year and 5 months and she is ready for a baby. This will be my sister first child. She feels like she is getting older and doesn’t have time to wait n when opportunity knocks she gonna answer

He approached her and convinced her he was mature enough to be with her

My sister use to have relations with his sister 10 years ago but it wasn’t a relationship it was just sex

But now she’s in love with the girl brother and she told me she didn’t know it was the girl brother the girl doesn’t know about the two of them she hasn’t spoken to the girl in 9 years

My sister wants my advice what should I say. I can tell she does love him but the age gap and the previous family affair got my speechless

My concerns is that he hasn’t lived yet but at the same time I want her happy I just don’t want her to think she has to settle just to have a child but at the same time I understand her struggle seeing pregnant women everywhere and she hasn’t had her first I’m torn any advice would be appreciated