Grosvenor married in 1677; he was aged 21, and his wife, Mary Davies, was only 12 years old.
The marriage was arranged by their families in a manner and at an age which was quite normal in England in that era; it proved to be harmonious and conventional, and lasted all their lives.
Mary was the daughter of Alexander Davies, a scrivener (scribe), and she had inherited substantial land to the west of London.
This was part of the Manor of Ebury (previously Eia), and Mary's portion consisted of 'swampy meads' (marshland).
The area was later to become the Mayfair, Park Lane, and Belgravia areas of London; the most valuable parts of the Grosvenor Estate.
The couple had three daughters and five sons.
Two of the sons, Thomas and Roger, died young; the other three sons all succeeded in turn to the baronetcy, Richard became the 4th Baronet, Thomas the 5th, and Robert the 6th.

Mary, Lady Grosvenor, had converted to Roman Catholicism shortly after coming of age.
Because of this, and because Eaton Hall was used as a meeting place for Catholics, Grosvenor's loyalty to the king was questioned.
 However, he continued openly as an Anglican until his death in 1700, and he was buried in Eccleston church.
Grosvenor's surviving sons were all under age at the time of his death; Sir Richard Myddelton, 3rd Baronet, and Thomas and Francis Cholmondeley were appointed as their guardians.

Mary was buried in the churchyard of St. Margaret's Church, Westminster, where in 1892, her tomb was the only one to be seen there, close to the north porch of the church.
Grosvenor married in 1677; he was aged 21, and his wife, Mary Davies, was only 12 years old. The marriage was arranged by their families in a manner and at an age which was quite normal in England in that era; it proved to be harmonious and conventional, and lasted all their lives. Mary was the daughter of Alexander Davies, a scrivener (scribe), and she had inherited substantial land to the west of London. This was part of the Manor of Ebury (previously Eia), and Mary's portion consisted of 'swampy meads' (marshland). The area was later to become the Mayfair, Park Lane, and Belgravia areas of London; the most valuable parts of the Grosvenor Estate. The couple had three daughters and five sons. Two of the sons, Thomas and Roger, died young; the other three sons all succeeded in turn to the baronetcy, Richard became the 4th Baronet, Thomas the 5th, and Robert the 6th.
Mary, Lady Grosvenor, had converted to Roman Catholicism shortly after coming of age. Because of this, and because Eaton Hall was used as a meeting place for Catholics, Grosvenor's loyalty to the king was questioned.  However, he continued openly as an Anglican until his death in 1700, and he was buried in Eccleston church. Grosvenor's surviving sons were all under age at the time of his death; Sir Richard Myddelton, 3rd Baronet, and Thomas and Francis Cholmondeley were appointed as their guardians.
Mary was buried in the churchyard of St. Margaret's Church, Westminster, where in 1892, her tomb was the only one to be seen there, close to the north porch of the church.
Sir Thomas Grosvenor, 3rd Baronet