Child spacing

I have 5 years between my brother and I and we weren't close until we were older (could also have been that my brother was sort of shy). I always thought that I would want less years between 2 kids because of that. My MOH and her brother have 2 years btw them and they were incredibly close. I also think gender makes the difference, 2 girls are going to be closer regardless of age than a boy and a girl but I think a less age gap btw a boy and a girl is much easier....does this make sense because now that I write it....it doesn't seem to....

Thanks Christy.