Hey Killer 7, i got an idea for you to solve your No Incest problem. I've played games like A Town Uncovered, House Chores and Life in Woodchester, where patreon banned incestuous themes, the way they got around the issue, was by allowing players to decide the relationship between the main character and the characters that are supposed to be related to the mc. That way, people can choose to enable incestuous content or not, and you'll be able to indirectly add in incestuous content without violating Patreon's Terms of Service.
E.g, at the start of the game, when the mc meets or mentions the relative, the game would ask the player what their relationship with the relative is. The default choice would be something like landlady, but players could be given the option of changing it to mother.