 Agnes's half-sister was Jean Brown (1750–1821) who, in 1775, married James Allan and lived at Old Rome Ford near Gatehead, in East Ayrshire.It was at Old Rome that Robert Burns briefly lodged in the summer of 1786 while avoiding a writ from James Armour in regards to his relationship with Jean Armour.The Allans were the parents of Burns' first cousin, Captain Alexander Allan, who founded the Allan Shipping Line in 1819.