Some time before 1666, Fingall married Margaret MacCarty, second daughter of
Donough MacCarthy, 1st Earl of Clancarty and Eleanor Butler. Luke and Margaret had three sons (of which the elder two died young and are not known by name): • Peter (1678–1718), his successor —and three daughters: • Elizabeth, married to Rowland Eyre, Esq., of
Hassop, Derbyshire, and of Estwell in
Staffordshire • Helena, married first in 1681 to Sir FitzGerald Aylmer, Baronet, of Donadea in
County Kildare and secondly to Michael Fleming, Esq., of Staholmog in County Meath • Amelia, married
Theobald Taaffe, 4th Earl of Carlingford, the last earl of Carlingford The marriage was a troubled one, giving constant anxiety to friends and family. The couple seem to have spent much time apart. == Later life ==