I would like to share info with those researching Boyd and Stevenson families of Co Antrim:

Stephenson Boyd, c1813, Co Antrim, Ireland, d.1878 Stoneymeadow, Lanarkshire, Scotland
Margaret Boyd nee Dean, c1824, Antrim, Ireland, d. 1911, Owaka, New Zealand
- married: 21 May 1842, Bushmill, Co Antrim, Ireland (one record of their marriage has Ballysha...[illegible], Antrim; a couple of other records simply have 'Bally' Co, Antrim)

Stephenson's parents were Robert Boyd and Letitia Stephenson of Billy, Co Antrim.
There is a possible match for them in the 1841/1851 Census Abstracts (Northern Ireland):
Boyd, Robert, head, 68, Antrim
Boyd, Letitia, wife, 64, n/a (nee Steen/Stinson)
Boyd, Letitia, dau, 28, Dunlace Lr
Boyd, Ann, dau, 18, Billy
Boyd - see: Blair, Thomas, grandson, Magherintendry