 In 1784, an Act was passed allowing the Crown to grant to the heirs-male the estates that had been forfeited in 1745, and on 8 March 1785 the Court of Session declared that he was the person entitled to the Drummond estates (including Drummond Castle), which he was duly granted.He submitted a claim to be Earl of Perth in 1792, but withdrew it in 1796, and on 26 October 1797 was created a Peer of Great Britain as Lord Perth, Baron Drummond of Stobhall in the County of Perth.On 31 March 1785, Drummond was married to the Hon.