Following is a list of awards Hawkings has received.
I wonder, if all of these medals should be returned, if your friend's father is correct that his work is simply borrowed from others.....
1975 Eddington Medal
1976 Hughes Medal of the Royal Society
1979 Albert Einstein Medal
1982 Order of the British Empire (Commander)
1985 Gold Medal of the Royal Astronomical Society
1986 Member of the Pontifical Academy of Sciences
1988 Wolf Prize in Physics
1989 Prince of Asturias Awards in Concord
1989 Companion of Honour
1999 Julius Edgar Lilienfeld Prize of the American Physical Society
2003 Michelson Morley Award of Case Western Reserve University
2006 Copley Medal of the Royal Society