Patrick & Mary Sims were my great great grandparents.
The son you mention below Matthew (b.1899) is buried in France where he died at the very end of WW1 in the last battle of the war.
He had another brother called Patrick which isn't listed below (probably because he wasn't present in the house on the night of the census) who also died in the first world war. He is buried in Belgium where he was killed at the battle of Ypres in 1917.
If you drop me a mail I can give you more info