Lord Balfour died in October 1634. He had two sons who survived him, but neither had heirs, and they died shortly after him. The title became extinct on the death of his younger son in 1636, however, it is possible he never succeeded to the title. According to The Complete Peerage, the succession of a third Baron Balfour of Glenawley has never been recognised in any peerage.[3]
The lordship of Glenawley was revived in 1661 for Hugh Hamilton, 1st Baron of Glenawley, whose wife, Arabella Susan Balfour of Pitcullo, was also a relative, a daughter of a Sir William Balfour,[4] and a nephew of Lord Balfour's daughter Anne.