The marriage parish record is on Family Search and confirms Peter was a Soldier.
Catherine McDonald Marriage 1 October 1866 Chesterfield, Derbyshire
Birth 1841 Parents Peter McDonald Spouse Frank Duffield
Colin,
Thank you very much indeed this, and for your earlier suggestions on my dilemma. I do rather favour Margaret being resident in New Brampton (DBY) in 1841, as a precursor to her marriage in Rotherham. One does wonder - wherever she was in 1841 - how she got the "job" so far from home, but I expect if we knew that it would be self-evident!
The 1861 Census entry for Stoney Middleton was my initial point of contact. As was noted on your posting of the entry, Catherine junior had an illegitimate daughter, Julia, and whilst it would be impossible to prove, I think Julia's father was John Goddard - living in a nearby household. I say this as John's father, William (my gt*3 grandfather) appears to have "adopted" Julia by 1871:
[1871]
GODDARD : William : Head : Mar : 58 : Lead Miner & Grocer : DBY : Stony Middleton
GODDARD : Martha : Wife : Mar : 66 : DBY : Stony Middleton
GODDARD : Elizabeth : Daur : Unm : 21 : DBY : Stony Middleton
MAC DONALD : Julia : Gran Daur : 8 : Scholar : DBY : Stony Middleton
GODDARD : Ellen : Gran Daur : 10mo : DBY : Stony Middleton
And by 1881, still resident with William, she was known as "Julia Goddard".
[1881]
GODDARD : William : Head : Widr : 67 : Lead Miner & Grocer : DBY : Stoney Middleton
GODDARD : Elizabeth : Daur : Unm : 30 : House Keeper : DBY : Stoney Middleton
GODDARD : Julia : Gran Daur : 17 : Cotton Spiner : DBY : Stoney Middleton
GODDARD : Ellen : Gran Daur : 10 : Scholar : DBY : Stoney Middleton
(Ellen Goddard, aged 10 was William's daughter Elizabeth's illegitimate daughter]
And yes, Julia appears to have been getting younger each decade! :-)
Rosemary