Robert, John & Ellen with 2nd spouse Elizabeth in 1871:
1861
Piece 573 Folio 2 Page 8
Low Church Paisley
County: Renfrewshire
Address: 7 Canal Street
POLLOCK, Jane Head Mar F 37 Laundress Paisley Renfrewshire
POLLOCK, Andrew son M 15 Draw Boy Silk Paisley Renfrewshire
POLLOCK, Isabella dau F 12 Domestic Servant Paisley Renfrewshire
POLLOCK, Robert son M 9 Tobacco Spiner Greenock Renfrewshire
POLLOCK, John son M 6 Scholar Greenock Renfrewshire
POLLOCK, Ellen dau F 3 Paisley Renfrewshire
So it fits with a few things missing.
John senior with his married daughter Isabella in later years.
Middle names help:
Jean Snodgrass DICKSON b. 23 Nov 1873 Middle-East-West Parishes, Greenock, Renfrew
- parents James Dickson & Isabella Pollock