Question: Who is Hugh Montgomerie, 7Th Earl Of Eglinton's paternal grandmother?

Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.
Margaret de Stafford
Margaret Stafford( born c. 1364; died 9 June 1396) was the daughter of Hugh de Stafford, 2nd Earl of Stafford, and Philippa de Beauchamp.
She was the first wife of Ralph Neville, 1st Earl of Westmorland, and the grandmother of the 2nd Earl.
George Montgomerie, 15th Earl of Eglinton
George Arnulph Montgomerie, 15th Earl of Eglinton, 3rd Earl of Winton( 23 February 1848 – 10 August 1919) was the third and youngest son of Archibald Montgomerie, 13th Earl of Eglinton and his first wife, Theresa Newcomen.
Hugh Montgomerie, 7th Earl of Eglinton
Hugh Montgomerie, 7th Earl of Eglinton (1613–1669), was the son of Alexander Montgomerie, 6th Earl of Eglinton and Anne Livingstone.
A student of Glasgow University, 1628
; he opposed Charles I's ecclesiastical policy.
He was a colonel under Leslie at the Battle of Newburn.
He failed to seize Tynemouth in 1640.
He was engaged in northern campaign under Middleton in 1646.
He was defeated by Huntly at the Battle of Aberdeen (1646), He was disqualified for public service until 1660 for being accessory to the Engagement.
He was taken prisoner in 1651 by the English and excepted from Cromwell's Act of Grace in 1654.
Hugh married Anne Hamilton in 1631 but she died soon after giving birth to a daughter, Anna Montgomerie.
In 1635 he married Mary Leslie.
His daughter Lady Margaret married the second Earl of Loudoun and was the mother of Hugh Campbell, 3rd Earl of Loudoun (c. 1675 – 1731).
Hugh Montgomerie, 12th Earl of Eglinton
Hugh Montgomerie, 12th Earl of Eglinton KT (5 November 1739 – 14 December 1819) was a Scottish peer, politician, and composer.
Alexander Montgomerie, 6th Earl of Eglinton
Alexander Montgomerie, 6th Earl of Eglinton (1588–1661), originally known as Sir Alexander Seton of Foulstruther, was the third son of Robert Seton, 1st Earl of Winton by his wife Lady Margaret Montgomerie, daughter of Hugh Montgomerie, 3rd Earl of Eglinton.
In 1612, after spending some time in Paris, and visting the exiled minister John Welsh of Ayr, he succeeded his childless cousin Hugh Montgomerie, 5th Earl of Eglinton, as Earl of Eglinton.
The 5th Earl had made a resigned and settled of the earldom and entail on Seton provided Seton took the name and arms of Montgomerie.
This was confirmed by King James VI in 1615.
Montgomerie's uncle Alexander Seton called the three year struggle for his nephew's earldom "this over langsome and fashious besines of Eglintoun".
Montgomerie petitioned against the imposition of Common Prayer Book in Scotland and assisted in the preparations of the National Covenant.
He was a Privy Councillor of Scotland in 1641.
Montgomerie, who was commonly known as "Greysteel", commanded a Scottish regiment of horse (cavalry) for the English Parliament and distinguished himself at the Battle of Marston Moor (1644).
On the execution of Charles I in 1649 he supported the recall of Charles II and the policy of the Marquess of Argyll.
In 1651 he was betrayed to Oliver Cromwell and detained in Edinburgh Castle, but afterwards allowed the liberty of Berwick.
His estates sequestered for two years, and he was included in Cromwell's Act of Grace.
In 1612 Alexander married Anne Livingstone, daughter of Alexander Livingstone, 1st Earl of Linlithgow and Helenor Hay, she had been a lady in waiting to Princess Elizabeth and Anne of Denmark.
Archibald Montgomerie, 17th Earl of Eglinton
Archibald William Alexander Montgomerie, 17th Earl of Eglinton( 16 October 1914 – 21 April 1966) was the son of Archibald Montgomerie, 16th Earl of Eglinton.
He was educated at Eton and New College, Oxford.
On 10 November 1938, he married Ursula Joan Watson and they had four children:
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Hugh Montgomerie, 1st Earl of Eglinton
Hugh Montgomerie, 1st Earl of Eglinton( c. 1460 – June 1545) was a Scottish peer.
Hugh Montgomerie, 3rd Earl of Eglinton
Hugh Montgomerie, 3rd Earl of Eglinton( c. 15311585) was a Scottish aristocrat who was a strong supporter of Mary Queen of Scots.
He was an important participant in a tumultuous period of Scottish history.

Answer: Margaret Montgomerie