I found the 3 youngest children:
1891 Census Kilmaurs, Crosshouse
Thomas Smith Head age 38 Freestone Quarryman born Ayrshire Maybole
Catherine Wife age 39 Born Lanark Crosshill East Kilbride
James son age 16 Coal Miner’s Drawer born Ayrshire Riccarton
David Son age 15 Freestone Quarryman born Ayrshire Riccarton
William Son age 13 Coal Miner’s Drawer born Ayrshire Kilmarnock
Thomas Son age 4 born Ayrshire Kilmaurs
Lizzie daughter age 10 months born Ayrshire Kilmaurs
1901 census Stevenston, Station Square
Thomas Smith Head age 44 Foundry Labourer born Ayrshire Maybole
Katherine wife age 50 born Lararkshire, E Kilbride
Thomas son age 13 Message Boy born Ayrshire Kilmaurs
Elizabeth daughter age 10 Scholar born Ayrshire Kilmaurs
Mary daughter 8 Scholar born Ayrshire Kilmaurs
William Son age 23 Railway Engine Fireman born Ayrshire Kilmarnock
Thomas Smith Marriage 14 Nov 1924 Stevenston
Thomas Smith age 37 Shipyard Labourer Bachelor
2 Station Square Stevenston
Father Thomas Smith General Labourer deceased
Mother Catherine Smith MS Law deceased
Married
Margaret Rowley Weir age 38 Spinster
Father John Weir general Labourer deceased
Mother Mary Weir MS Rowley
Witness Robert Craig Crawford Old Lea Road Beith
Witness Margaret Weir 5 Shore Road Stevenston
Mary Smith Marriage 5 Mar 1920 Stevenston
James Surgeoner Brookes age 24 Crane Driver Bachelor
Stevenston
Father Thomas Brookes Ironmoulder
Mother Margaret Brookes MS Connally deceased
Married
Mary Smith age 25 Dynamite worker Spinster
10 Station Square Stevenston
Father Thomas Smith
Freestone Quarrier
Mother Catherine Smith MS Law
Witness Michael Brookes
Witness Mary Walker Byron
Sorry could not find Lizzie marriage or anything on her
