m. (1) Fanny Powys, (2) (in 1900) Amelia Smith.

His birth:

Surname First name(s) District Vol Page
Births Jun 1856   (>99%)
Stone Percy Goddard Pancras 1b 6
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His marriage record gave his forenames.

In the 1881 census he was living at 55 Carlton Hill,, London, Mx with his wife Fanny M B Stone, no children and two servants.  He was an architect, aged 25 and born in Marylebone:

Name Relation Condition Sex Age Birth Year Occupation  Disability  Where Born

STONE, Percy G Head  Married M 25 1856 Architect  Marylebone, Middlesex
STONE, Fanny M B Wife  Married F 31 1850 Wife Of Architect  Brazil
RUSSELL, Alice Servant Single F 26 1855 Cook (Domestic Servant)  Ryde, Isle of Wight, Hampshire
RUSSELL, Fanny E Servant Single F 18 1863 House Maid (Domestic Servant) Ryde, Isle of Wight, Hampshire

RG number: RG11 Piece: 164 Folio: 85 Page: 3    

Registration District: Marylebone
Sub District: St John
EnumerationDistrict:
Ecclesiastical Parish:

Civil Parish: St Marylebone Municipal Borough:
Address: 55, Carlton Hill, St Marylebone
County: Middlesex
______________________

In 1891:

Name Relation Condition Sex Age Birth Year Occupation  Disability  Where Born

STONE, Percy Head Married M 35 1856 Architect  Regents Park, London
STONE, Fanny Wife Married F 40 1851     Brazil British Subject
STONE, Percy Son M 7 1884     Marylebone, London
STONE, Winifred Daughter F 9 1882     Marylebone, London
STONE, Gladys Daughter F 8 1883     Marylebone, London
STONE, Enid Daughter F 4 1887     Marylebone, London
STONE, Dorothy Daughter F 3 1888     Marylebone, London
PUNCHARD, Elizabeth Boarder Single F 45 1846 Governess  Little Wratting, Suffolk
SMITH, Susan Servant Married F 40 1851 Cook Domestic Servant  Steeple Langford, Wiltshire
WICKENS, Emily Servant F 24 1867 House Maid Domestic  Marylebone, London
CRAIG, Alice Servant F 15 1876 Kitchen Maid Domestic  Kilburn, London

RG number: RG12 Piece: 105 Folio: 61 Page: 28    

Registration District: Marylebone
Sub District: St John
EnumerationDistrict: 20
Ecclesiastical Parish: St Marks

Civil Parish: St Marylebone
Municipal Borough: West Marylebone
Address: 55, Carlton Hill, St Marylebone, West Marylebone
County: London
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In 1901 he had moved to the Isle of Wight, had a new wife, Amelia aged 30 and born in Brading, Isle of Wight, but still had his daughter Winifred with him.

The marriage was:

Surname First name(s) District Vol Page
Marriages Jun 1900
Smith Amelia Frances I. Wight 2b 1253   
Stone Percy Goddard I. Wight 2b 1253

I have not included this marriage as it did not lead to Powys descendants.

In 1911 he was with his new wife and his daughter Dorothy.  They reported that his second wife had had no children.
_______________________

His death:

Surname First name(s) Age District Vol Page
Deaths Mar 1934   (>99%)
Stone Percy G 78 I. Wight 2b 971
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A Biog from the I of Wight site of Memorials and Monuments

Percy Goddard Stone was born on 15th March 1856, in London, the son of Coutts Stone, an Architect.
Taking up his father's profession, Stone came to the Isle of Wight, and began his investigations into the architectural antiquities of the Island.
In 1879 he married Fanny Maria Belden Powys, daughter of James Morrell Coventry Powys, a Gentleman.
They had five children, four girls and a boy, Percy Vere Powys Stone, who was born in 1883.
One daughter (Winifred Powys) is buried at Shanklin Cemetery and there is an additional grave marker for P V P Stone too.

His wife died in 1898; he remarried, Amelia Frances Smith, a member of the Roach Smith family of Sandham (Sandown).
Percy Goddard Stone worked on architectural investigations at Quarr Abbey in 1891, the same year that he published his definitive survey of "The Architectural Antiquities of the Isle of Wight from the XIth to the XVIIth centuries inclusive".
Stone also wrote the Isle of Wight section of the "Victoria County History of Hampshire and the Isle of Wight" (Volume V, published in 1912).
This drew on the local knowledge of Sir John Oglander, but it was not without errors.
His architectural commissions included work on the Gatehouse at Carisbrooke Castle, and the rebuilding of the Chapel of St Nicholas as the memorial to Charles I, who had been imprisoned there. The chapel was rebuilt in 1904.
Stone also designed the chancel screen at St George's Church, Shalfleet, in honour of Thomas Hollis, a local man.
Stone's most important work was the redecoration of the Chapel of St Nicholas at Carisbrooke Castle, as the Isle of Wight County War Memorial. This occupied him from 1919 up to 1929 when the Chapel was re-dedicated.
Percy Goddard Stone died on 21st March 1934 at The Cottage, Merstone, Isle of Wight.
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Their marriage on FreeBMD:

Surname First name(s) District Vol Page
Marriages Sep 1879   (>99%)
POWYS Fanny Maria B I.Wight 2b 943   
STONE Percy Goddard I.Wight 2b 943