The IGI has an extracted record for a Charles Morton born 17th September 1862 in Whitekirk, East Lothian, son of Peter Morton and Maryanne MacGregor and an Isabella Agnes Morton born 11th December 1864, also Whitekirk, East Lothian. These are obviously two from your list.
Peter and Mary Anne married 6th December 1861 at Kirknewton And East Calder, Midlothian (again, IGI extracted record).
I hope I am not colluding with you to deceive your dearly beloved
but .. you don't need to 'join' Scotlandspeople per se, it is not like Ancestry, you just register and then buy credits. The minimum is 6GBP for 30 credits - this will buy you five index searches and five certificates (if you are careful) and I would say you have enough info here to put all these people together.
I would start with the marriage cert of Peter and Mary Ann, you will get both sets of their parents this way plus here is their entry from the 1881 census to start you off ...
Living at Kirknewton & East Calder, Edinburgh
Peter MORTON, Head, aged 51, Oilwork Labourer, born in Wigtown
Mary MORTON, wife, aged 46, born in Kirknewton, Edinburgh
Helen MORTON, daughter, aged 14, Domestic Servant Unemployed, born in Kirknewton, Edinburgh
Mary MORTON, daughter, aged 8, scholar, born in Kirknewton, Edinburgh
Jessie MORTON, daughter, aged 3, born in Kirknewton, Edinburgh
regards,
Lindsay