Have you ever been a member of the Trennels community? I was when it was on Livejournal, but I didn't follow it to Dreamwidth when LJ folded, and it seems to be defunct now, though you can still read the archives.
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There is, somewhere, a quite spectacular row about whether Pam Marlow was wrong to blow the proceeds of the Last Ditch on buying herself Chocbar and Catkin for Ginty, when family finances were dicey and some Marlows were horseless. It had a million vituperative posts, and covered everything from social class to bad parenting to hunting to sharing in big families, and tempers flew very high.
I loathe Rowan, who is always so damn sure of herself, and a natural games captain type (which I do not mean as a compliment). I think she'll end up heavy-drinking and embittered if she stays on the farm.
Giles is a far worse, male version of the same thing, all Fair Isle jumpers and natural air of command. Nicola just worships him because he's male and in the Navy (though I've always felt that the moment in RAH where she sees him across a railway station, doesn't at first recognise him in the distance, and thinks he looks 'fairly gorgeous' is weird).
I vaguely feel it would have made the world a better place if Surfrider had gone down with all hands, because Giles is awful, and Peter is headed for a career where his incredible lack of judgement about risk, and his terror of his own fears, is might potentially kill a lot of other people.
If, as one hopes, he recognises the Navy isn't for him, he might turn out OK, especially if he confines 'testing himself' to running ultramarathons or something.
Patrick grows up to be Jacob Rees-Mogg, the foul, yellow-eyed, ultra-Tory little beast.
I like to imagine Ann as something big at an international charity, maybe running Medecins Sans Frontiéres or Red Cross operations in a warzone, or something. and actually being admired for her level-headedness and generosity. In my head she marries a devout Muslim medic, they are incredibly happy, and she calms down about little things like refusing to lend her bike to someone going to a Tridentine mass.
I suspect both Ginty and Lawrie have to cop on once they leave school and the family environment and discover that the world in general doesn't light the gas for them or forgive them everything because they're pretty, charming and good at hockey.
I think drama school might be the making of Lawrie, especially if she realises lots of people are just as good as her, and some better and has to really knuckle down.
Ginty I imagine not in fact marrying young, but ending up as the longtime mistress of a Tory MP. Not Patrick. Someone much older who treats her rather badly.
Nicola is hardest to predict.