Here they are in the 1851 census for Lasswade too:
Lasswade, Rosewell,
Watson, Thomas, m, HD, M, 49, coal miner b. Newbattle
Watson, Beatrice, f, WI. M, 52, b. Cockpen
Watson, William, m, SO, U, 24, coal miner, b. Lasswade
Watson, Samuel, m, SO, U, 21, coal miner, b. Lasswade
Watson, Euphemia, f, DA, 17, paper mill worker
b. Lasswade
Watson, Thomas, m, SO, 14, coal miner, b. Lasswade
Watson, David, m, SO, 8, scholar, b. Lasswade
Watson, Andrew, m, SO, 6, scholar, b. Lasswade
And here is their oldest daughter:
Parish of Liberton: Liberton Kirk
Taylor, George, m, HD, M, 42, parochial schoolmaster b. FIF, Largo
Taylor, Catherine, f, WI, M, 49, b. FIF, Cupar
Taylor, Catherine, f, DA, U, 10, scholar, b. FIF, Anstruther West
Taylor, William, m, SO, U, 8, scholar, b. FIF, Anstruther West.
Watson, Beatrice, f, SV, U, 19, Servant. b. MLN, Lasswade
Elaine