A while back I wrote a post talking about how, once it becomes clear Perse is the reincarnation of Perseleia Kronide, her siblings will attempt to awkwardly hang out with her. I gave scenarios for Zeus, Hades and Hera, but here are some for the rest.
Poseidon runs into the problem of her still being his daughter, so all the non-intervention laws still apply. However, those same laws don't apply to Amphitrite, who finds all sorts of fun ways to spend time with her sister-in-law/stepdaughter. She's also mature enough to do so in a way that won't freak her out. Perse arrives home one day and Amphitrite is just... there, chatting it up with Sally like she isn't the mortal who slept with her husband. Turns out they've been doing this for weeks.
Demeter, like Hera, also tries hanging out in Perse's highschool, but she's even less subtle. I can picture her showing up without even altering her age and lecturing Perse's friends on their eating habits, giving unsettling reasons like 'your untimely deaths due to vitamin deficiency would upset my sister'.
Hestia doesn't need an excuse to spend time with Perse because she's perfect already and everyone is happy to be with her regardless. I imagine she figures it out first of the elder six, perhaps even from when they first meet.
Bonus points: Kronos himself wishing to spend time with his daughter. Imagine if during the Labyrinth section, instead of a duel, Perse just walks in and there's just Kronos-possessed Luke with a gaming console or something like 'if you can best me in a round of this 'Mario Kart', I shall release your companions'.
