I don't know why Bethesda insists on some personal plot point as though anyone cares. The fantasy of the post-apocalypse is not to go finding your family members. The fantasy is to get away from your previous life. To start over. Cast off shackles. Making us go looking for family members is antithetical to the post-apocalypse. We should just be wanderers in this new world. That doesn't mean you can't have a strong plot, and it doesn't mean you can't form bonds with characters. But it does mean you shouldn't drag those elements with you from the old world. The entire point of the genre is to start afresh.