Was Peter senior born & baptised in 1866 Paisley, married by 1891 with 2 yr old son Robert, and with his parents Robert & Elizabeth (nee Hart) in Neilson St, Paisley in 1901?
If so, what was his marital status in 1901 per the image on Scotlandspeople (still married? or widowed?) and have you traced his wife Mary, if she was still alive, in 1901?