First, I think it's time to admit that I'm jealous of my SIL. I think it's because she'll be filling a void in my in-laws' life that I will never be able to. Rather, that I never want to.
Second, I am not really a "cat person" but I really like cats.
The guilt that I, as the only male child of my family, *should* have a child, still peeps through sometimes. Not very often, mind you, but enough that it never totally disappears.
And I *love* cats -- always have. But my wife is allergic to them.