Beau might know Indy through Josie since he's a little older. My others wouldn't really know him unless they crossed paths with him otherwise? Though Finnley depends on how good of friends he becomes with Charlie, probably.
Remington is the closest in age with Ethan. They might somewhat know one another just from growing up in town. Same with Finnley on that front! Beau and Ethan could possibly cross paths on campus at University, though Beau is an undergrad.
Of course, we have Finnley and Albert. She loves him, despite all of their differences. And she's trying with Toma, I think. She will continue to try with her as we go along. Remington might know him at least vaguely from close in age plus both being from wealthy families.
Beau could know Zee from University once she gets started! She's also Finnley's age or thereabouts so maybe we can find some kind of connection for them? They could possibly be friends. Remi will probably only know her if she ever comes in to get or order sweets? Unless they fall into some other connection way.