I just checked the 1881 and 1891 Scotland census, as well as births in Scotlands People for James and Peter Jr. James was born 10Dec1883 and Peter 28Sep1880. Robert Rae DOB 1890 died at 3 days of age. I didn't look at the certificate of death, but as he was a twin and a neonate, he was high risk. There actually were 2 sets of twins, the first I have come across in my family tree.