I really hate feeling this way, I wish I didn't care one way or the other, but personally I think a lot of my disappointment stems from the family dynamic I had growing up. I had 2 brothers, and no sisters. My brothers and I never got along, and now that we are all into adulthood, we very rarely have anything to do with each other. I see them but once a year, and they will say maybe 2 words to me. My brothers have bad mouthed me behind my back, and have stolen money from me while I was in town visiting (we live 6 hrs apart, so I don't get to visit often)
Perhaps even worse was that they have never acknowledged their niece and nephew. They've never played with them, held them, or bought them gifts for the holidays. Not that material items matter, but for a lot of people gifts are expressions of love and affection, neither of my brothers have ever sent my kids a birthday card or anything.
About 2 years ago before DS was born my daughter went into my youngest brothers room to say hi and talk, he was playing video games, obviously couldn't be bothered to pay her any attention, and the only thing he said was "Could you just get her out of here?" That was last thing either of my brother said to my kids. Whenever I see people on fb post about how much they love their niece or nephew, I get jealous that my kids don't have that. I don't talk to them about their uncles or mention their uncles at all, so they are completely unaware, but I still feel heartbroken that my children don't have loving people like that in their lives.
I know it probably doesn't make sense, it may even sound strange or weird, and I know full well that every child and family is different. I have no reason to even feel this way, but I guess my GD comes from being very fearful that if I had another boy, it would resemble the family I had growing up, and I don't want what happened to me happen to my children.
Anyway, that was really long, and really personal, sorry!