Am I right that the conservative United etc one has most of the UK members of free masonry?
Yes.
it meant taking time away from home and family and putting yourself and others above your own domestic duties and needs and obligations, with lots of pointless dinners and time spent away from home when clothes have to be washed and children read to in bed etc.
I doubt it was as pointless for your grandfather as your mum thought it was @Xenia.
For an otherwise present parent, I don't think one evening per week is too much time to dedicate to the effort of learning, discussing, exchanging ideas and working on bettering oneself.
She was very scathing of it all
I am not surprised, if she felt that her father was neglecting her to go tell jokes at dinner parties.
of course the sexism in most branches is the killer for many of us women
I agree that the stubborn insistence of United Grand Lodge Of England to exclude women is indefensible in this day and age. It is worse than a men-only cigar club or a men-only golf club because Freemasonry is an intellectual pursuit. If women and black people are excluded, it is with the assumption that we lack the intellectual capacity to be Freemasons which of course is an antiquated and false assumption.
I can't blame the Freemasons in the lodges of United Grand Lodge, though. They get invited to "Freemasonry". They don't know that theirs is not the only way an that there is another, more modern and liberal way to do the craft until they are settled in the lodge and have made friends. Even then, they are told that all other Freemasons around the world who don't follow their conservative rules are not real Freemasons.