Boiled down for simplicity:
It would be a remarkable occurrence by the kinship system operating at the time if Walter FitzGilbert de Hamilton was not a son of Gilbert de Colville, shown in the Writs of Military Service of 1292 in Scotland as Gilbertus Coleville, a son of Walter de Colville; of a family well established in Scotland, and which were kin of the Comyns and Umframvilles. He was given the confiscated lands of the former family, and his descendants used the armorial bearings of the latter.
I feel it incumbant to amend the above statement:
It would be an absurdity by the kinship system operating at the time if Walter FitzGilbert de Hamilton was not a son of Gilbert de Colville; but an absurdity given breath by attempts of the living to construct events to suit their need.
m.s.
See also: https://walterfitzgilbertdehamilton.wordpress.com/2016/09/01/hamilton-fairy-tales/
Walter FitzGilbert de Hamilton 