“Who are ‘they’, Mrs. Trask?”
Let’s start at the middle, and work backwards from there.
Mrs. Minerva Trask — devoted wife and helpmeet of the celebrated Reverend Gregory Trask of Worthington Hall — arrives at Collinwood with a jar of damson plum preserves, and proceeds to make herself comfortable — or, at least, as comfortable as Mrs. Trask ever allows herself to get.
She’s come over to give the preserves to Judith Collins, because that’s what you give to a multi-millionaire who lets you operate a for-profit business in her back yard rent-free. But instead, she ends up talking to Judith’s dissolute brother Quentin, who’s currently dissolving in the drawing room.