At the moment, the three non-elders of the household can be... Fostered or technical-relation, semi-related or related. (All except Max), can be an exchange-student.
How do brother and sister get married? Illegally, or just a social bond. Marriage is NOT only "legal" and/or "religious" bonds. However, I plan to take the technical-legal way into this.
Poor state records and divorces with adoptions can easily "hide" the fact that there is any "blood relation". Several people have been married, who are blood-related family.
Mother marries her daughter and her son.
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Marriage situation: Yes, for the story, it is required. Even if related, honestly, Max is as much of a swine. (He is fucking everyone in the household.)
You will have no problem hating Eric, when you see how much MORE of a prick I made him. Remember, Max is eventually going to be fucking EVERYONE in the house, except Eric.
If I made him, "just a guy with Ann", it would degrade the story, a lot. (Unlike the "Big Brother" story, this one has believable content that makes sense, at every step of the way.) Unfortunately, it is hard to portray that, without portraying that.
Copyright infringement: Well, without actual copyrights, anything in, "The public access", for more than a year, is beyond any copyright protections. If you want to get technical, you also have to have a copyright in each country that you want protection from. That is why you can't copyright a bible. I don't think that copyrights will be an issue. I plan to get any appropriate "blessings" (permissions), from the available contributing artists.
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"Big Brother", is copyrighted in America and in many other countries. It is a television show about a bunch of people all living in the same house, under surveillance by hidden cameras. (Sound familiar? I doubt I will be perused, in any event. Still, I plan to honor the creators of all contributions.)
Again, taking note that the game is "free to the public", which includes the artworks within. I am not just ripping the game and slapping a link back to my patreon-account as the "creator" of the original game. I am not using any of his written content. Not using the same game-engine. Not using the same game-elements. Just the art, which may still be modified, or eventually recreated completely. (Though, if that happens, then all links back to "big brother" would be removed, which would be a loss for him and a gain for me.)
Again, I will cross that bridge when I get there. I am not near the bridge yet.
P.S. I am also going to be WAAAAAY behind him, in development. I have a strange feeling that he will be adding a LOT more people and possibly bringing-back the real father, into the story. He seems to be building forwards and backwards at the same time. Something I do myself. I am trying to pre-calculate for that too, a little.