Ya, I'm with ya, I was wondering on my first playthrough if that was the case, too. In later chapters it's more clear they are blood siblings, but early on it's kinda iffy.
Ya, I've seen some devs who come on here and are outright aggressive toward members, which is never recommended in any sales field - nothing will cost you customers and sales more quickly than that. And I'm not defending the rude posters, because sometimes people on messageboards are just assholes, but when you, as a developer or really any company that's trying to sell a product come around and are rude to members, or lie, etc. that does not endear you to anybody.
My advice to any dev on F95 who wants to sell a product is this - be friendly to your community, answer questions in a friendly way - if people are rude, just disengage, don't take it too personally as chances are that member is just a dick and isn't worth the time - but otherwise, just be nice to people and the ones who have bought the product or who are actively a patron and giving you money, just express your appreciation to those people. When I see any company or individual making a product that I want more of and they seem to be a genuinely decent person trying to make a good product for people, I legitimately *want* to help them and that's when I go buy the game, etc. And with this game as an example, as long as it stays good and developer stays friendly toward people, etc., when it launches on Steam, I will go onto the messageboards for Steam and I'll buy a couple of people a copy of the game just to support the developer (I'm already donating via patreon myself). I have enjoyed this game so far and I want more of what I've experienced so far - happy to get my wallet out to further that objective.