I'm taking a bit of a guess here from the information we have found on the censuses

Hopefully you can verify Duncan's parents' names from his marriage certificate to Betsy. There are a family of Livingstons from Morven that might fit for Duncan's family. An Allan Livingston and Janet McInnes had the following children:
1. PATRICK LIVINGSTON Birth: 08 FEB 1828
2. KATRINE LIVINGSTON Birth: 18 NOV 1829
3. MARY LIVINGSTON Birth: 24 AUG 1831
4. DUNCAN LIVINGSTONBirth: 02 JUL 1833
5. JOHN LIVINGSTON Birth: 11 SEP 1837
6. ANN LIVINGSTON Birth: 27 JAN 1844
The names above would fit the 1871 census entry we have for Duncan with brother John and sister Catherine.
This family in the censuses:
1841 - everyone showing as born in the County apart from Allan:
Allan Livingston 45, agri. lab, b. Scotland
Jannet Livingston 40
Patrick Livingston 13
Cathrine Livingston 11
Duncan Livingston 9
Aexander Livingston 7
John Livingston 5
Mary Livingston 3
John Livingston 55
Mary Livingston 90
Address: Lochaline Village, Morvern 1851:Allan Livingston 55, Gen Labourer & Fenar, b. Morvern
Janet Livingston 52, b. Dundee
Mary Livingston 18, b. Morvern
Duncan Livingston 16, b. Morvern
John Livingston 13, b. Morvern
Ann Livingston 8, b. Morvern
Donald Cameron 2, grandson, b. Morvern
Address: 9 Livingston's, Lochaline, Morvern Argyll1861:Allan Livingstone 67, agr. lab. b. Morvern
Catherine Livingstone 28, agr. lab. b. Morvern
Duncan Livingstone 26, agr. lab. b. Morvern
Peter McLean 5, relative
Address: Cardenoch, Cadder, LanarkshireAs I have mentioned, parents' details need to be verified for Duncan before you can be certain this is his family line.
Monica