The successor: Black Duncan
Grey Colin was succeeded by his eldest son, Black Duncan, who inherited both his father's ambitions and his drive, proving to be more ruthless in his methods and surpassing Grey Colin's record for expansion in all categories (BBT 23-72).
Strained family relations
In the last year of his life Grey Colin wrote to Black Duncan, (1583-1631), while Duncan was working on Colin’s behalf in Edinburgh, addressing him as his 'wellbelovit sone' (GD112/39/15/8). They seem to have had a good working relationship at this time.
However, on becoming the 7th laird Black Duncan quarrelled with his mother, Kate, over the lands she held in liferent, a common problem between noble mothers and sons during the early modern period.
The dispute centred on the lucrative lease of the royal lands of 'Discher and Toyer' on either side of Loch Tay. John Fenton, the royal Comptroller, gave Kate legal advice on her position and also encouraged both parties to settle the quarrel.