Hi Angie
This looks a possibility for Alexander and family in 1891, not sure what his wife's name but the only entry coming up that connects with the Alexander in 1881 in Ochiltree:
Alexr Brown 50, Farm Worker, b. Ochiltree
Maggie Brown 34, b. Ochiltree
David Brown 4, b. Ochiltree
Thos Brown 2, b. Fenwick, Ayrshire
Address: 8 Church St, Ayr, Ayrshire
And in 1901:
Alexander Brown 59, agr. lab., b. Ochiltree
Margaret Brown 43, b. Ochiltree
David Brown 14, b. Ochiltree
Alexar K W Brown 9, b. Straiton, Ayrshire
Martha W Brown 6, b. Straiton, Ayrshire
Mary K Brown 1, b. Straiton, Ayrshire
Jane Gibson 20, servant - housekeeper, b. , b. Barrhill, Ayrshire
Mary Laddar 16, general serv. b. Dalmellington, Ayrshire
Jane McLean 18, general serv, Craigmark, Ayrshire
Hugh Sharp 52, farm servant, b. Old Cumnock, Ayrshire
Address: Grimmet, Straiton
Regards.
Monica