Nephew Dodds

On my Round TUIT is a task to work through Nana's photo album scanning the photos, and publishing them, some for identification purposes.
The album itself has seen better days,

but does hold a treasure trove of photos, mostly from the DAVIDSON/BAIN side of the family, some even identified, albeit well after the event, by my late Aunt Isabel HENDERSON. These notes were invaluable to me when I began, all those years ago, to try and work out who on earth was who, and where they all came from.
Whereas the BAIN and HENDERSON side of the family has some chance of finding others in NZ with the same photos and some family knowledge, I am the sole remaining DAVIDSON descendant from the two brothers (Adam and James) who emigrated in the late 1870s, all of their siblings remaining in Scotland, with only Agnes (below) moving away - to Gateshead.
The next generations spread further afield with representatives in Canada and Australia as well.

The photo selected today was labelled as a nephew of Grandfather Davidsons named DODDS.

Research had indicated that he was therefore likely to be a son of William DODDS and Agnes Robertson DAVIDSON who married at Chirnside (Berwickshire) in 1869 where the known sons are James (born Chirnside, 1870), John (b. Chirnside, 1871) or William (b. abt 1877 Gateshead).
The only other obviously identified photo of this branch is of a family group

labelled as "Mr & Mrs DODDS & family Grandfather Davidsons relations", with the reverse showing the photographer as Woodcock & Robinson.
This same photographic studio was responsible for other unlabelled photographs in the album  (same backdrop) that seem likely to be the prior generation of either the FAIRBAIRN or DAVIDSON forebears of my Great Grandad Adam DAVIDSON, and it is assumed, his sister in the photograph above, Agnes Robertson DODDS nee DAVIDSON.
BUT, those two children look further apart in age than James and John would be, and if the younger is actually a girl and Rosina, where's her other older brother? (All survived to adulthood.)
Wonder why there's no photo of daughter Rosina Hunter DODDS (b. 1874, Chirnside)?

Anyone recognise these photos?

Here's a WikiTree descendant chart from John DAVIDSON, father of Adam and Agnes.
Anyone interested in contributing to WikiTree to update the family knowledge would be most welcome, registration is free.