Did we raise an American?

This morning when I made toast for me and the little man, he asked for "jelly". He really wanted jam, but referred to it by its American name. He's been doing this a lot. Hayley, who lived for many years in the US, swears she isn't responsible for this dilution of the Queen's English, even though she still sometimes talks warmly of her past fondness for "peanut butter and jelly"!