He married twice, firstly on 14 January 1828 to Ellen Turner (who had previously been abducted at the age of 15). They had one son who predeceased his father and one daughter. Ellen died in childbirth in 1831. His second marriage on 3 October 1843 was to
Maud Lowther; they had no children.[1]
In 1830 he was one of the initial proprietors of the Wigan Branch Railway.[a]
Thomas Legh made his nephew, William John Legh, his successor. William later became Baron Newton. Thomas Legh died on 8 May 1857.[1]