Er ist verheiratet mit Mary Keith.
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Sir William was served heir of his father in the barony of Tullibardine 6 Oct. 1461, and in ward in 1463. He had sasine of the barony of Tullibardine 10 May 1465.
In 1490 the Drummonds set fire to the church of Monivaird killing seven Murrays and thirteen others. The offenders were brought to trial in October 1490 and on 9 Jan. 1491 Lord Drummond entered into a bond with William to make reparations for the misdeeds of his second son, David, who was then an outlaw, for the burning of the church and the slaughter of the Kings subjects.
William was made Steward, Forester, and Coroner of the Earldom of Strathearn and lordship of Balquhidder by royal letters 18 Jan. 1482/1483.
William was frequently in Parliament and was a commissioner to negociate with the English and had a safe conduct for six months into England 22 May 1495. In 1507 he was excused from attending court or the Kings host due to his advanced age.
He had a charter to Trewin and the loch and isle of Dry Isle on 17 Apr. 1506. He had a new charter on 2 Mar. 1511/1512 to the Bordland of Glencoy in the barony of Tullibardine which had been appraised for £100.
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