Switzerland has a set of brothers.
Croatia has a set of brothers.
England has a set of brothers (although Phil Neville hasn't played yet)
According to my better half, one of the teams has a father and son playing - which is quite something. It takes three quite separate conditions - for the father to be fit enough to play at International level in is mid thirties; for the son to be precocious enough to play in his teens; and for there to be a relatively small age gap between father and son. Which team is it?