Which English Premier footballer came on as a substitute for his father during an international match?

whoever finds the answer deserves a medal as, at first blush, there isn't an answer:

George E. Eastham (1 cap, 1935) and George R. Eastham (19 caps, 1963-66) were the first of the three father-and-son sets who have won full England caps, followed by Brian Clough (2 caps, 1959) and Nigel Clough (14 caps, 1989-93), then Frank R. G. Lampard (2 caps, 1972-80) and Frank J. Lampard (4 caps, 1999-2001).

www.englandfootballonline.com/TeamHist/Triv.html

I can't find any reference to an English player doing this. However, one player in the English Premiership has done so, Eidur Gudjohnsen. See for example:
http://www.soccernet.com/england/news/2002/0310/20020310thfccfcgudjohnsen.html

Well done Stew, I had hoped it would have been left unanswered a bit longer,kind of a trick question

nice one, I presumed he was English.
I presumed wrong.