Someday I have to have a son. I have a buttload of cousins - something like 40+, and 21+ aunts/uncles including six on my Dad's side... but of those six, five are girls who took another guy's last name and the last only had two daughters. Of my siblings, I'm the only guy with the last name of Towns (stepbrother has his father's last name). So it's all resting on my sperm picking the right gender. Whee. I'm hoping for a boy and girl. Someday. Someyear. Probably when I'm around 30. :( I'll be a "not with it" Dad. :(
But yeah. One son, one daughter, that'd be ideal.