I honestly feel like I could convince the sisters to have a threeway loving relationship. Porn logic, but I think the game will let it happen. Their moms on the other hand....Yeah over the past few years I've made the habit of saving at every choice and before every sex scene (from back when there were no replay galleries). If only real life had do-overs, though most of it I wouldn't change, other than maybe having fewer kids.
Even if it results in an absolutely broken, sad finish, I would love an ending where I got the moms too.