Another reason to have a family: It's a smart crowd that visits Inductivist, so I'm sure you guys have thought about this before, but I have to make the case anyway.
Many readers are atheists, and I, myself, have to make the case to you for having children? A Christian like myself hopes for existence beyond the grave. If I have no kids, so what, I will never end.
Many of you respect evolution and genes as well. Nature says if you don't have kids, you basically missed the point. You are a big, fat loser. You crossed the finish line last. In my view, it's not completely inaccurate to say you are your genes. (My pro-life position probably has something to do with this view). An endless chain of ancestors got you here, and you're okay being the loser who brings that awesome success to a pathetic end?
I've got a bunch of little Rons running around (God help us). They might not be able to continue the ancient chain, but they have a better chance than your non-existent kids. It's the closest you're going to get to immortality, unless you're Isaac Newton or George Washington. And sad as it is, most of us ain't Newton or Washington.
Now, some of you might not care in the least about your ancestors or immortaility. Understood. But let me make one more pitch, even though it will probably fail to move your type as well. You are capable, talented folks. Your community, your country needs the kinds of kids you would raise. In these selfish times where duty means little, this argument will sound pathetic, but I'm making it anyway. Who's going to run America in the future: your kids or those of your high-school dropout neighbor?
And for those of you who do believe in life after death, I'm probably preaching to the choir about having a family, but you simply do not know you will exist beyond death. Any thoughtful person recognizes they could be wrong on this. So hedge your bet, and if it turns out that you're nothing more than lunch for worms, well, the family goes on.
Also--encourage your relatives to have kids. You should be making my arguments to them. Even if I was childless, I have twelve nieces and nephews and dozens of cousins. Think of yourself as one element of the clan, and how the clan might go on indefinitely. It might not work for you, but I like the thought.