Myron Culbert, Four of his Sons, his Mother, and an Unidentified Woman

Can anyone identify this woman?

She's standing in the back row, far left of the photo below...

Back row, left to right: unidentified woman, Jane (Fairhall) Culbert, Myron Culbert holding baby Earl Culbert. Front row, left to right: 
Mel Culbert, Ivan Culbert, Mert Culbert.

Myron Manford Culbert (back row, far right) is holding his son William Earl Culbert who was born 11 May 1929. Earl looks to be at least one year old so that's why I'm guessing the photo was taken sometime between the middle of 1930 to 1931.

Myron's sons in the front row are (left to right): Milward Taylor "Mel" Culbert (born 29 May 1920), Ivan Hector Culbert (born 3 August 1918), and Merton Manford "Mert" Culbert (born 21 December 1926).

The woman wearing glasses and standing beside Myron in the back row is Myron's mother, Jane Eleanor (Fairhall) Culbert. Jane's husband, Richard Culbert died 2 June 1932, presumably before this photo was taken.

Missing from this photo are Myron's wife, Effie (Taylor) Culbert and their two eldest sons, Clifford Burton Culbert (born 10 September 1912) and Kenneth Arthur Culbert (born 9 June 1916). Perhaps one of them is the photographer.

I don't know the identity of the woman on the far left. Is she a friend? A relative? A Culbert descendant?

I don't know whose house this is, the exact year the photo was taken, nor why Mel and Ivan were wearing their "Sunday best." 

There was nothing written on the back of this photograph. I only know the identities of the other people because I'm Myron's granddaughter. So if anyone knows the name of this woman or recognizes the house, please leave a comment or contact me by email.