Ordinary Boy looks like lots of fun, DeHe and kec, thanks!

I wonder if your kids would enjoy the Bagthorpe books by Helen Cresswell? http://en.wikipedia.org/wiki/The_Bagthorpe_Saga
There are lots of books in the series, about a large family with several "extraordinary" members and one "ordinary" one (the first book is called "Ordinary Jack"). There's more to Jack than there appears, of course; the children solve various problems very inventively. We've only read a couple of them (loved "Bagthorpes vs the World"), but possibly they might appeal?