From what Ev has found for 1881, is this the family for 1891:
David Stewart 36, Coal Agent & Carter b. Thornhill, Perthshire
Elizabeth Stewart 40 b. Crieff, Perthshire
James Stewart 9 b, Denny, Stirlingshire
Elizabeth H Stewart 7 b. Denny, Stirlingshire
Mary S Stewart 5 b. Thornhill, Perthshire
David M Stewart 3 b. Thornhill, Perthshire
Janet Stewart 10 Months b. Thornhill, Perthshire
Address: Main St, Kincardine, Perthshire
Monica
