Foreign Secretary William Hague said it was "very understandable" that Ed Miliband would want to defend his late father, Ralph Miliband, in the "fierce argument" over a story in the Daily Mail which claimed he hated Britain.
Hague said it was "very understandable that In any walk of life, not just in politics, that a son jumps to the defence of parents".
He added: "It is a fierce argument that is going on. I don't know enough about Ed Miliband's father to weigh in but it is very understandable."
Both the Editor and owner of the Mail on Sunday have apologised for a reporter intruding on a private memorial for Ed Miliband's uncle.
Ed Miliband has written to the Daily Mail's chairman Lord Rothermere to complain about a reporter attending his uncle's memorial service.
The PCC said it had received 384 complaints by 4pm on Wednesday relating to Daily Mail articles about Ed Miliband's father.