do this family actually exist.

[silvery]

In freebmd there's a birth for

Thomasina Cunningham,
Sept 1901
District Berwick, vol 10b page 541

[trish1120]

Marriage from FreeBMD;
Robert Foggin HENDERSON, Sept 1897, Alnwick, 10b 633
Margaret JOBSON on same page

Robert/Margaret name their 3rd Son Robert F in 1901 Census.
(Birth Reg June 1900 as Robert Foggin Henderson) 

Trish

[trish1120]

Hi sharon, greetings from Sydney

Please dont follow some Family Trees as they have the wrong Parents for Robert 1875, Father of John Robson Henderson.

Marriage FreeBMD;
Alexander HENDERSON, June 1870, Glendale, 10b 626
Elizabeth FOGGON on same page

If you look for Alexander Henderson born 1844 Rosedon, Northumberland on the 1881 Census on Familysearch you will find him/Elizabeth and Children including a Son Robert c 1875.
A bonus is Elizabeths Mother is there also

Trish

[Radcliff]

Try your local library ours has free computer access  to (A) if you are retired or unemployed,a small hourly fee if you are not ,

[Radcliff]

1901 census
Glanton Pyke
RG13/4842
Robert Henderson,head,aged 26,coachman,born Amble
Margaret Henderson,wife aged 25,born South Middleton
Jane aged 3
Alexander aged 3
George aged 1
Robert aged 10 months,all children born Glanton

next door Joseph Henderson,gardener, aged 45,born Ovingham
Isabella,aged 42,born Scotland
John aged 18,gardener ,born Gatehead
Alice aged 12,born Gateshead