I suspect her mother (who lost a baby son) preferred her remaining son to my mother, Jess, and my mother too lost my younger brother's twin when he was 2. Very sad for my parents, his twin and me. 
As I have mentioned before, my Mum is a huge snob and, I think, married my father, partly, because his family was well off. We were never as 'comfortable' as she would have liked and she felt very hard done by and disappointed.
DH has a good job, I stayed at home and I suspect that she was disappointed that, instead of living as she thought we should, we had 5 children, are very family orientated and didn't do the social things she expected of people in 'our position' 
Youngest brother, though, has tons of money, one child and does everything expected of him - big cars, flash holidays etc.
I think I've mentioned before that my Mum used to tell people that I 'had help with the children'. When I asked her why, she said 'I wouldn't like people to think that you were barefoot and pregnant in a council house'. Rather than relishing the 5 grandchildren, she seemed embarrassed about them
Although now she enjoys the kudos of having (my) 5 great grandchildren.
Flipping families [grrrrr]