There were marriage announcements for Harry and Alice but unfortunately they don't have any new details.
Eastern Evening News
17 Jul 1907
page 2
Marriage
Jolly-Flatt
July 13, Harry Jolly to Alice Flatt, both of Norwich
Norfolk Chronicle
20 Jul 1907
page 1
Marriage
Jolly-Flatt
July 13th, Harry Jolly to Alice Flatt, both of Norwich
Assuming Harry is son of John Thomas Jolly and Mary Jane Pridmore, then his paternal grandparents would be Samuel Jolly and Ann baker. There's a lovely newspaper item for Ann.
Peterborough Standard
12 Sep 1908
page 8, column 5
Woodnewton
Active At Eighty-Eight
Hale and hearty at 88 is Mrs Ann Jolly, of Woodnewton, to whom a representative of this journal was introduced a day or two ago. Mrs Jolly, who resides with her blind daughter, has been a widow for 38 years. "I do the washing for myself and daughter," said Mrs Jolly; "and," she added proudly, "I have been digging potatoes this morning!" The lady, who is a native of Washingley, regularly attends Church and gets about well with a stick. Last year her sister - Mrs Elizabeth Davis, of Benefield - died, in her 91st year. Mrs Jolly has five children alive, her eldest son, Mr John Thos. Jolly, of Corby, being in his 59th year.
The unnamed daughter would be Sophia, who died in 1935. There's a newspaper item about her death and funeral, but unfortunately no mention of Harry amongst the mourners.
Peterborough Standard
26 Jul 1935
page 24
Deaths
Jolly
At Woodnewton, Jul 18, Sophia Jolly, 72
Peterborough Standard
26 Jul 1935
page 23
Woodnewton
Funeral of Miss Jolly
- The funeral took place at St Mary's Church on Monday,
- of a much respected inhabitant in the person of
- Miss Sophia Jolly
- Her death occurred at Peterborough Hospital
- on Thursday after a short illness,
- at the age of 72 years
- Miss Jolly, who was of a quiet and kindly disposition,
- will be greatly missed by her many friends
[continues, with list of mourners, floral tributes and description of coffin]