My friend Jeri had a son the other day, and so now Annelise has a brother. We went to visit, and Aidan had a fabulous time with AE, basically ignoring the baby. No problem.
While we were leaving, he asked me, "Mommy, who can be my brother?" There is no forthcoming brother, but I don't want Aidan to feel left out. He's got Audrey, his little cousin, but she's a girl. I mentioned Conner, my husband's best friend's son, who's 5 months younger than Aidan and lives about an hour away, and who he's called his brother for years (as many years as he's been able to talk, that is - admittedly not many). He perked up and said, "Yes! Conner is my brother."
Then he did what he's been doing lately - expounding upon a principle he's just worked out in his head. "Sometimes, Mommy, even if you're almost the same age or the same size, or if you live close or far away, it doesn't matter. Someone can still be your brother. Even if they're far away, they can still be your brother. Sometimes."
That's right, Baby - sometimes.