My son is now 8 he has a half sibling on his dads side who he's never known but attends the same school this child's mother now wants our children to meet and form a relationship, my son has never known his dad as his dad has never wanted too not that I haven't tried over the years this sibling of my son has a relationship with said dad and now the mother of the child thinks our children should meet any advice is welcome as I'm on the fence and don't know what to do for the best interest of my son thanks in advance x