He married an Englishwoman, Mary Franklin (died April 1758), against his father's wishes and was disinherited by his father. Their children were: • American Revolutionary War hero and former
British Army officer
Major General Richard Montgomery •
Colonel Alexander Montgomery, M.P. for County Donegal in 1768 and British Army officer •
John Montgomery (1728–1787), a merchant in
Lisbon, Portugal •
Sarah Montgomery, who became Lady Ranelagh after marrying
Charles Wilkinson Jones, the 4th
Viscount Ranelagh. Up to 1729 his first cousin Colonel
Alexander Montgomery shared the parliamentary patronage of Lifford, County Donegal with the Creighton family, the
Earls of Erne. There is an agreement in the
Erne papers (held in the Northern Ireland Public Records Office) dated 1727 between Alexander Montgomery and General David Creighton about the sharing of
Lifford Corporation and its representation in the Irish House of Commons, to which it sent two MPs. One of the articles of agreement was that, if Montgomery should die without a son, then his interest should pass to the Creightons. Montgomery was elected as an MP for Donegal County in the
General Election held later on in 1727, so General David Creighton and his son and heir,
Abraham Creighton, (later the 1st Lord Erne) were returned as the two Lifford MPs. General David Creighton died in 1728 so the Lifford seat was filled by Thomas Montgomery, the nephew of Alexander. On the death of Thomas Montgomery in 1761, full control of the Lifford seats passed to Abraham Creighton. Thomas is recorded as leasing land at
Abbeville, Dublin from 1736. ==References==