[MysticCat]

I'll throw in one other thought -- get your boyfriend to talk to his brother and find out what these kids like or are interested in.

For example, my daughter would probably love something from the Disney store, while my son would hate it (and would have hated it when he was 5). iTunes gift certificates? Make sure they have iPods first. (Believe it or not, not all kids have them.) Chinaberry has the kinds of things that some kids love, others don't. (My son views the kinds of things they have as stuff that grown-ups think kids ought to want.)

By finding out what they like, you can get something they'll think is cool and still keep the price down. It also helps you get to know the kids better.