She was Frederick's sister
1891  New Malden, Surrey
RG12; Piece: 609; Folio: 5; Page: 4
Big family! 
Charles J Paine   43 Furniture Dealer
Mary A Paine   39
Fred W Paine   21
Bryan C L Paine   18
Eliza M Paine   17
Mabel S Paine   14
Patrick H Paine   12
Martin M Paine   9
Ida K Paine   7
Charles P M Paine   5
William E Paine   3
Dennis F Paine   1
For info.
Frederick William Paine Bpt. 6 Aug 1871 Norbiton, St Peter
Charles James Paine occ carpenter
Mary Ann Paine
A snippet from this link
http://www.kingstononline.co.uk/kingstons-history-frederick-paine-funeral-directors/Frederick William Paine was 
born 4 April 1870 on Burritt Road in Norbiton. 
As the eldest of 11 children he took over the family business of house furnishers, estate agents an funeral directors at the age of 24 and developed their funeral service………….
Using the above dob +/-1 free search 1939 Register 
shows a Frederick W PAIN b1871  Kingston-upon Thames 
click preview and it shows       
Charles A Moatt 1884 and 3 more people are on this record
you will need credits to view the original
https://billiongraves.com/grave/Frederick-William-Paine/3441268#/Surname PAINE
Charles James 
Mary Ann 
Gladys Ethel
Cecil George
Bryan Charles Sargent
Bottom inscription reads
In affectionate rememberance of Frederick William Paine
 “undertaker of this town”
who passed away suddenly March 20th 1945 in his 75th Year
New GRO search shows following
BARON Rachel mmn  HAMPSON      
1875  S Qtr, 
Wigan  Volume 08C  Page 117
You can also search birth & marriages on Lancashire BMD 
http://www.lancashirebmd.org.uk/ and on
http://www.lan-opc.org.uk/26 Dec 1875 St John the Divine, Pemberton, Lancashire
Rachel Baron born 15 Sep 1875 dau of James Baron occ collier & Ellen Abode: Newtown Pemberton
James & Ellen's 1872 marriage details can be found on Lancashire OPC 
Hopefully her marriage certificate will confirm if the above is correct Rachel