Here is a photo of a boy and girl which has on the reverse of the original in a child's handwriting "Wishing you a jolly Christmas and a Happy New Year Nellie & Robert". These are the siblings of my Grandpa William.

In recent travels around the web (Robert W. Wrathall's Lineage), I note mention of Nellie Wrathall, who is presumably a sister of your grandfather. I attach a wedding photo (21 March 1921) of Harold Flanagan and Amy Biggs taken at Farnhill Hall. The bridesmaid at the right in the second row is Nellie Wrathall, one of Amy's friends.

William E. Biggs, the bride's father, is seated in the front row at the right. He married Mary Ann Halliday, sister of Wilfrid Halliday, my grandfather. Mary Ann died sometime before 1917.

Farnhill Hall .... was .... a private house owned at that time, I believe, by the Riddehough family. Robert Wrathall died in 1912 and his widow, Nannie, moved out to Grassington at the time of the Riddehough purchase.