I did a lengthy reply which evaporated so here we go again. According to Dave Bradley's website, Thomas's parents were Thomas Lennox and Margaret McClernon and that Margaret was in Durham in 1851 and died about 1860 (this is close to Maria's death in 1864). This would agree with another tree that seems to think Margaret and Maria are the same person. According to Dave Bradley on Geneanet, Thomas Sr. died in 1827 which would make it impossible for him to be the father of Thomas born in 1834. But on Rootsweb, the same Dave Bradley has an alternate date of death of abt 1845 in Magherafelt which fits the picture better.
According to Dave on Geneanet, Thomas and Jane had children
F Elizabeth (S) Lennox 1858-1875
M James Lennox 1859-1944 (note - Peggy thinks from censuses that James was born 1864 unless
there was another James born in 1859 who died.
F Eleanor Jane (Married a Lewison) Lennox 1869- Peggy knows from 1891 and 1901 censuses that
Eleanor married Robert McGuire unless her second marriage was a Lewison)
M Thomas Lennox 1872-1911
M Nicholas Lennox 1874-1923
M Joseph Lennox Oct 22, 1875 to Apr 21, 1876
Another tree had children for Thomas and Jane of Mary Jane, James, John and Thomas with no years of birth given, between Elizabeth in 1858 and James in 1864. This fits with an earlier James born in 1859 but since both are born July perhaps there is no 1859 James.
Thanks everyone for your help and the dates of death for Jane, and Thomas and Maria. At first, I was sceptical that Margaret and Maria were the same person but maybe.......
Thomas Jr. had siblings Mary Anne born abt 1827, Samuel born abt 1825, Jane born abt 1826, and possibly a previous Thomas or perhaps the date of birth for Thomas was never 1820 but 1834. I have traced Jane and Mary Anne.
Peggy