Thank you so much everyone for all your thoughts on these photos!
The occupants of the croft in the 1920s were a married couple and their children. She died in 1925 (age 33) and he died in 1930 (age 52). I don't know what she looked like, but do have a photo of him and its not a match to the people in the mystery pics.
The previous "man of the house" was a man who died in 1918 aged 83 years. I don't know what he looked like but was supposed to have been a big chap.
He had two daughters, one who I don't know what she looked like but would have been 48 when her father died in 1918. The other daughter I have seen a photo of and its definitely not her in the mystery pic.
Is it feasible that the photo could be as old as 1918 or even a couple of years before that