My children are fairly close in age - and whilst of course I understand that people can invite whoever they choose to a birthday party, I really don't feel really comfortable taking one and not the other, and promised myself that the next time it happens I would just decline politely with a prior commitment. Now it's happened and I'm wondering, is this just me being uptight? We're not talking a small and intimate event, and there will definitely be children over a fairly wide age range. I would never invite one child and not the siblings. Isn't that like inviting the husband to a party but not the wife?