1891 Census address 8,Montgomery Street Port Glasgow
John Walker age 60 ...Boilermaker
Jane Walker age 55
John Walker age 25 ...Ship Caulker
Charles Walker age 18 ..Apprentice Joiner
Robert Walker age 14 ..Rivet Boy
To go further back with the family you can try
www.scotlandspeople.gov if you have not used this site it will cost you £ 7.00 to buy 30 credits ..In doing a search will use 1 credit and to view a record will use 5 credits ...You can check for a death for John and Jane Walker which will give you their parents names if known when recorded ..Hope this helps
Rosie