GRO births
ROBERTSON, Jessie Moncrieff mms. MARKHAM
1898 JunQ Bury Saint Edmunds Vol 04A Page 819
ROBERTSON, Alec Moncrieff mms. MARKHAM
1900 MarQ Bury Saint Edmunds Vol 04A Page 929
ROBERTSON, Ada Bertha Moncrieff mms. MARKHAM
1902 JunQ Bury Saint Edmunds Vol 04A Page 942
ROBERTSON, Alan Moncrieff mms. MARKHAM
1904 JunQ Bury Saint Edmunds Vol 04A Page 960
ROBERTSON, Elizabeth Ellen mms. MARKHAM
1905 SepQ Bury Saint Edmunds Vol 04A Page 936
ROBERTSON, Dorothy Gwendoline mms. MARKHAM
1907 SepQ Hull Vol 09D Page 286
Census 1901 England at 26 Turkey Place Armstrong Rd Bury St Edmunds Suffolk
ROBERTSON Alec M 40y painter b. Carlisle Cumberland
ROBERTSON Mary 30y b. St Neots Huntingdonshire
POBERTSON Jessie 3y b. Bury St Edmunds
ROBERTSON Alec 1y b. Bury St Edmunds
Census England 1911 @ 5 & 6 St James Place Cemetery Rd Bury St Edmunds Suffolk
...married 14 years....5 children born....5 children living......
...Jessie 13, Alec 11, Ada 9, Alan 7, Elizabeth 5......
Where is Dorothy?
The birth certificate you have is for.....Elizabeth Ellen ROBERTSON?
You need to see the birth certificate for Jessie Moncrieff ROBERTSON born 1898.
Her name, as mother, on this certificate, is the earliest evidence you have so far that your Mary Markham, born Huntingdonshire, ever existed.
You would hope for a residential address for birth, and name of informant.
Mary MARKHAM, aged ~ 27 at birth of Jessie, would be older than average for birth of first child.
If they are not married it would be because Alec, and / or Mary, are already married.
Alec would seem to be strongly committed to using Moncrieff as a given name, so earlier children to him might also see this name used.
When Alec died, 1917, what happened to wife Mary?