McGregor cares way more than his sister what everybody thinks; he wishes she wouldn’t wear pants in public, because she’s drawing negative attention to them and it might offend people (she doesn’t care). He says if not for her support, his being ostracized for coming out as gay might have destroyed him, but she stuck with him, through thick and thin and didn’t care what anybody thinks; she loves him anyway. It was hard for him to admit that about himself, but also hard for him to go against himself. McGregor doesn’t like adventures and doesn’t like the jungle; he would rather go to a civilized place like Rome and do what aristocrats are supposed to do, which is drink fine champagne and hang out in all the right clubs. He shows up in a hot, awful Amazon (in his mind) and brings ten crates of luxuries, which he assumes he will be taking on their “jungle cruise” full of all sorts of lovely things to make it feel more like home. He doesn’t imagine it will be any different from London, hence he will need that dinner jacket! He objects to Frank tossing them into the river and refusing to take them all with him. If left to his own devises, he’d live in the lap of luxury in London and never inconvenience himself. He doesn’t easily adapt to the environment, and bases a lot of his massive sighs over his sister’s behavior on “how like her this is.” She’s doing this again. He says her way of doing things is to throw herself into them and figure them out as she goes, which he sees as reckless. He’s not above tolerating her fanciful ideas, though he’s somewhat reluctant to follow through on them due to the inconvenience.

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McGregor really struggled with coming out as gay, because of all the conflict and rejection it caused him, and he only was able to feel okay about it because of his sister’s support. He repays her by going along with whatever she wants to do, on a constant basis, even though he expects to get pampered in the process (bringing tons of luggage to the Amazon, going through his little routines below decks, etc.) He doesn’t want her behavior to cause anyone to look down on them, or for it to offend people, but also doesn’t actively do anything to stop her. He rather calmly handles bad situations, remaining unruffled much of the time, and preferring not to do anything himself (let Lily drive, I’m awful at it). He’s willing to sacrifice his free time to go along with her, even though he’d rather be other places. Though he and Frank fuss at each other about his suitcases, he does nothing to prevent Frank from tossing them in the river, and soon forgives and even befriends him on their journey.