BearSmart

Newbie on US Airways tickets reservation. Really appreciate any comments/ideas.

We are a family of 4 (2 adults, 2 kids). We each have individual Dividend Miles account and each have enough miles to redeem for a business class ticket from YYC to SAN. My wife and I can call for ourselves to make our own reservation but my kids are too young to call. Will US Airways agent let me make reservation for my kids using my kids' own Dividend Miles?

Another question is what's the chance for us to get 4 business tickets on the same flight?

Thanks!!