He is married to Lady Catherine Maxwell Baroness Kennedy.
They got married in the year 1440, he was 34 years old.Source 7
They got married in the year 1440 at Maybole, Ayrshire, Scotland, he was 34 years old.Sources 7, 9Child(ren):
https://en.wikipedia.org/wiki/Gilbert_Kennedy,_1st_Lord_Kennedy
http://www.thepeerage.com/p2150.htm#i21499
http://trees.ancestry.com/pt/AMTCitationRedir.aspx?tid=83357721&pid=16695/ Ancestry.com