Hi Neil & Liz & welcome to Rootschat Liz

Neil, did you check out the death record 1924 N Berwick for William Sives,was I on the right track??
Here is some brief census details -
1881 - Yester 1891 - Whittingham 1901 - Corstorphine
William Sives 28 William Sives 38 William Sives 48
Jane 25 Jane 36 Jane 46
William 6 William 16 William 26
Alexander 4 Alexander 14 Alexander 24
Margaret 2 Margaret 12 Maggie 22
Robert 10 Robert 20
John 8 John 18
Peter 6 Peter 15
James 3 James 13
Alexander 13
Wilhelmina 9
John 9
from my SP previous seaches - Peter Bell Sives died 1934 aged 49 in Haddington makes his birth abt1885.
Alexander Siv(is) & Christina Simpsons other children
Robert Simpson Siv(is) b29 June 1855 Saltoun died 1856 Saltoun aged oyrs
Lilias Marion Siv(is)b14 Aug 1856 Saltoun
Alexander Siv(is) b13 July 1861 Saltoun
hope above helps
Fiona