My DH Father left home when my DH was 15, my DH does not know why.
His Father did not keep in contact with my DH but did continue to have contact with DH sister.
We married 16 years ago and my FIL wanted to be in the wedding (or his mother told him he would be, i don't know)
Our son was born 10 years ago and my FIL wanted to meet his grandson. We hoped that this may have been the start of contact for my DH and his Father but it was not to be the case.
We have been doing the family tree and in doing so have discovered a half brother. We have found him on Facebook and can see the resemblance and have ordered a birth certificate which has proved the fact.
My DH does not know what to do next. He doesn't have a close relationship with his sister and we don't think she will cope with this information well, she stopped having contact with her dad possibly 7/8 years ago now.
We are concerned that if we bring this up now while his Grandma is still alive (FIL Mother) that it would kill her (she's 96).
We assume that no one in the family knows.
We don't want to speak to my MIL as we think it's hurtful although from the dates the Half brother was not conceived until 6 years after my FIL left home, so possibly not having an affair - who knows!
We also have an aunt we could speak with but we are concerned that she will shut us down (GM and Aunt are the matriarchs)
We don't have the ability to contact my FIL unless the Aunt rings him, no one is allowed to have a number for him.
There is also the thought that everyone else knows and my DH doesn't which will of course be hurtful to find out too.
We have thought about seeking outside help but don't know where to turn.
What would you do?