The game is developed up to the point that you can fuck all members of your family. The full story never got finished. The dev abandoned this game and inserted a remake of it instead in his new game glamour. This game was very popular due to having the best renders during its time and remained popular due to its content and "scandals". A lot of people would reference or compare new porn games from this game even to this day.
If you wish to play this game, make sure to reference the guides at
Big Brother: Walkthrough & FAQ Thread 1st and 2nd post, else you can easily get lost in the game or even lose important scenes. Read and follow the guides to get to the route you wish to go. Any game related questions will be answered there, not here. Being a sandbox game, you'll need to read, reread, reread, and reread the guide every step of the way to make sure you are doing things right. Patience is also a big key to this game. It took me months to finish it to its latest version.
Just for a heads up, the route with the most fucking (literally) content is the one where you make your younger sister your girlfriend. The other routes weren't developed much.