Hi Hiraeth,
I don't have the answer to your question, but have you looked for his Will to see if his mother is mentioned in it?
I have the same situation with my ggrandfather, only it's his wife that is not metioned with regards to being a mourner or sending a floral tribute, his mother was the chief mourner....most odd

His wife would have been about three months pregnant with their second child at the time of his death when he was 32.
She is not mentioned in his Will either, all siblings were left a memento and money to his mother. I have wondered if he had already given his wife the majority of his money as he knew his death was imminent, but it doesn't account for her not being at his funeral. Surely the Parish Council would not have allowed for his wife and children to be left destitute, this was in 1902.
I have since learned that no one from his family ever called on his wife or children in the years after his death, so surmise that there was some bad feeling within the family.
Ambers