Crum was the eldest son of Walter Crum FRS of Thornliebank and his wife Jesse Graham, daughter of William Graham of Burntshiel, Renfrewshire.
Walter's son Alexander Crum who took over the printing works was a major philanthropist supporting housing, education, and leisure facilities in the village.
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Crum-Ewing was born Humphrey Crum, the son of Alexander Crum of Thornliebank, Renfrewshire and his wife Jane Maclae, daughter of Walter Ewing Maclae of Cathkin.