Say that you haven’t made your decision yet, but Brown is a strong contender. It’d really help you if you could visit, perhaps sit in on a couple classes with freshmen, but your parents can’t afford to fly you there. Is there a way Brown could help you with the cost of plane tickets? And of course, say thank you for any help they can provide. (They’ll typically cover plane fare + food + accomodation in a dorm, and sometimes they’ll throw in a plane ticket for a parent, although the parent has to pay for their accomodation. But it’d mean a trip to the East Coast for $100, a pretty good deal for the parent too.)