The first Earl's nephew, Robert Dalzell, Member of Parliament for Dumfries, was created a baronet, of Glenae, Dumfries, on 11 April 1666, in the Baronetage of Nova Scotia. He was the son of the Honourable Sir John Dalzell, himself the younger son of the first Lord. The baronetcy was to pass from father to son, until the third Baronet succeeded as the fifth Earl of Carnwath in 1702 by virtue of the Earldom's special remainder, with the peerage titles then merging with the baronetcy.