It's something that seems strange to me about Patreon, I understand why they ban it but not the criteria they use to apply the ban.Unlikely, since they're both sisters (and it goes against Patreon's TOS iirc). Now if Alexis was to be included in a harem (she doesn't belong in one atm), that'll be interesting to see happening.
Maybe they have a bias to play using translation patches, but visual novels like "Grandma House" have several family scenes not suitable for the whole family (for example the visits to the O'reilly house, or the visits to the Aaliyah's House), and the game is funded through Patreon.
Personally, if I wanted to see the Crazy Harem (Alexis and Kylie) proposal come true in the game, the scene of Kylie spying on the MC and his sister could be used to kick off the events of their harem, or maybe a story of revenge on Kylie's part when she found out the real reason why the rumor was created that Alexis cheated on the MC during high school, serving in turn as a reference to a fanfic that someone wrote a long time ago about Kylie, showing that her The yandere side can also serve to protect those he loves and not only to traumatize the player.