In a way it's kind of ironic really, though. All the way through school she seemed to feel bitterly overshadowed by me intellectually -- not helped by idiot teachers who said things like "why can't you be more like your sister?" -- and now it's her who's forging ahead through academia, while I'm happy to remain Jill of all trades and mistress of none. No, really, that's not veiled jealousy; I genuinely do enjoy my lazy dilettanteism, and I know now that I would have gone stark staring mad doing a DPhil. Lorna's more focused than me, though, and I say good luck to her.
I'm so happy for her, and so, so proud of her. And no, I never tell her this because it would embarrass her; but I kind of think she knows anyway... but doesn't say because it would embarrass me. :-)