His birth is not to be found in the registrations for Torquay around 1856, not even listing all births merely with the surname Griffin and born in Devon..

His baptism transcript:

First name(s) Frank Wetherall
Last name Griffin
Birth year 1856
Birth date 26 Aug 1856
Baptism year 1856
Baptism date 19 Sep 1856
Denomination Anglican
Baptism place Torquay, Tormoham
Father's first name(s) Francis John
Mother's first name(s) Sophia Louisa
County Devon
Archive South West Heritage Trust
Archive reference 2189A/PR/1/5
Record set Devon Baptisms

And the image of the Register adds:

Sponsors:  Fredk Aug’s Wetherall, Fredk H’y Pakenham Wetherall, Aug’a J D Wetherall (the mother’s father and two siblings)
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In 1861 he was in London with his mother and two siblings.

In 1891 he was in Hammersmith with his wife Elizabeth and one servant.  he was chief clerk in Cooperative store.

In 1901 he was married to Ella K and had, just, the same three daughters as in 1911.

In 1911 he was a Managing clerk at a Cooperative store, married to Ell Caroline and with three daughters and she stated that they had only ever had three chilred, all living:

Name Relation Condition/ Yrs married Sex Age Birth Year  Occupation  Where Born

GRIFFIN, Frank Wetherall Head Married M 54 1857 Managing Clerk At Cooperative Stores  Torquay, Devon
GRIFFIN, Ella Caroline Wife Married 14 years F 44  1867  Germany
GRIFFIN, Ella Frances Daughter Single F 12 1899 School-Girl  Putney, Surrey
GRIFFIN, Lilian Louisa Daughter Single F 11 1900   School-Girl  Putney, Surrey
GRIFFIN, Jona Evelyn Maud Daughter Single F 10 1901   School-Girl  Putney, Surrey

RG number: RG14 Piece: 2414
Reference: RG14PN2414 RG78PN80 RD26 SD7 ED23 SN136

Registration District: Wandsworth Sub District: Southfields
EnumerationDistrict: 23 Parish: Wandsworth

Address: Wimbledon Park Road Southfields S W
County: London
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One of these might be his death:

Surname First name(s) Age District Vol  Page
Deaths Sep 1912   (94%)
GRIFFIN Frank W 57 Wandsworth 1d 500   
Deaths Mar 1925   (95%)
Griffin Frank W 71 Kingston 2a 588

The first is the area he was living in in 1911 and ties in with a birth in 1855, so I’m going with that.
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Here is his marriage but the possible wives do not quite make sense with the 1891 and 1911 censuses:

Surname First name(s) District Vol  Page
Marriages Mar 1881   (>99%)
DUNDAS George Aldridge Kensington 1a 261  
GRIFFIN Frank Wetherall Kensington 1a 261  
Legge Frances Elizabeth Kensington 1a 261  
WILLIAMSON Eliza Frances Kensington 1a 261

But in 1911 he and his wife had only been married for 14 years, so it looks like his first wife died early on.

And indeed here is his second wife, the mother of his children:

Surname First name(s) District Vol  Page
Marriages Jun 1896   (>99%)
AHERN Jane Paddington 1a 26   
Brooks Richard Paddington 1a 26   
Grey Ella Caroline Paddington 1a 26   
Griffin Frank Wetherall Paddington 1a 26
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In 1911 census he stated he had the infirmity of a “stiff elbow” and his family was:

Surname Forename  Age  Gender  Relation  Marriage Status  Years Married  Occupation  Birth Place

Griffin Frank Wetherall  54  Male  Head  Married  14  Managing Clerk At Cooperative Stores   Torquay, Devon
Griffin Ella Caroline 44 Female Wife Married  14  Germany
Griffin Ella Frances 12 Female Daughter  Single -  School Girl   Putney, Surrey        
Griffin Lilian Louisa 11 Female Daughter Single  -  School Girl   Putney, Surrey
Griffin Iona Evelyn Maud 10 Female Daughter  Single  -  School Girl   Putney, Surrey

Reference: RG14 - PN2414 RD SD ED- SN136

Address: Elida, Wimbledon Park Road, Southfields S W
Registration District: Wandsworth
Sub District: Southfields
Civil Parish: Wandsworth
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His burial transcript, confirming that his death was the Wandsworth registration:

First name(s) Frank Weatherall
Last name Griffin
Gender Male
Event year 1912
Burial year 1912
Burial date 28 Sep 1912
Burial place Putney Vale Cemetery, Wandsworth, Surrey
Place Wandsworth
County Surrey
Country England
Record set England Deaths & Burials 1538-1991
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No probate found in the five years after his death.

See his Notes for details of his two wives.