I think I have found this family in the 1841 census where John is listed as a farmer at Nethermuir, New Deer. The entry shows the other children listed here as well as William and James (who is 1 day old and unnamed).
Parent:
His father was John Mutch [J8]
Relationships:
Spouse Janet Gibson. They married 26 October 1823 in the parish of Peterhead.
Children were:
- Jane born 1822 in the parish of Peterhead - died 30 January 1900 at Tollhouse, Tillyfourie in the parish of Monymusk. Married Robert Hacket
- Margaret born 1825
- Martha born 1828. Married Alexander Strachan
- Vilat born 1830
- Mary born 1834 in the parish of Peterhead
- Anne born 1836
- William born 25 December 1838 christened 16 January 1839 in the parish of New Deer
- James born 5 June 1841 christened 10 July 1841 in the parish of New Deer