Wigan Album

lovely photo but nobody told them to say cheese in those days

Lovely photo, what year would this have been taken?

Looks very much like the 1920s.

St Mary's Marriage Registers have two Jackson weddings from No. 26 Boundary Street: Martha (23) to Henry Greenwood (24) on 28th December 1935. Her father is given as James J., Collier, and Johanna (23) to widower Alfred Bretherton (39) - both were Explosives Mixers, so presumably met in a wartime munitions factory near Wigan. Her father is given as John J., Collier.
If the fathers' names are recorded correctly, the brides were presumably cousins.
Most of the rest of the pics in the Lymm St./Boundary St. area sequence were sent by Allan Greenwood - he has a pic entitled 'Siblings, 1926' showing a girl of similar appearance to the one seated on the left here. He also has a pic of his grandfather, James Jackson in WW1 - presumably the father of Martha, married in 1935.

Martha & Johanna were sisters.

Then the Register entry giving Martha's father as John is incorrect. Do you have a copy of the original Certificate to check whether it was an error made at the time, or in transcriptions since?
I notice you've you've just put up a pic of your dad Alf Bretherton - from that and what I've written about the Greenwood/ Jackson marriage, you and Allan Greenwood are cousins.
Can you name the children in the pic - i.e. is it Johanna and Martha plus brother and sister?

Martha,Catherine,Johanna & Arthur.

It's (L To R) Martha, Katherine and Johanna with Arthur in the foreground. Their fathers name was James, so your entry in the register is wrong David.

Interesting only just come across this picture, Johanna Jackson was my grandfather's step mum.