Amended Same names born Ireland - odd coincidence
1851 Census Scotland 3 Stanners Street, Greenock, Renfrewshire
John Tonne 50 Born Ireland labourer
Catherine Tonne 50 Ireland
Helen Tonne 18 Ireland worker in a Flay Mill
Frances Tonne 16 Ireland Groom
Catherine Fonner 11 Visitor Ireland
ADDED
This gives father as John not William