(Mamoru's adopted family is Reji(father) Hinata(mother) Hinako (sister) Reiko(sister) and Taro(brother). Reji and Hinata raised Mamoru after his parents died and taught him well, Taro and Reiko got along with Mamoru while Hinako was an entitled brat and always thought she was better than her family, she was also money hungry. She had to move in with her parents again because she spent all her money on shopping and got fired at her job for being rude to the customers and for using the work card for shopping expenses. And no, not even Usagi hasn't met them so get prepared for chaos)
It was a rainy day, and you all stayed inside. Usagi and Chibiusa were both fighting over the strawberry cake, Mamoru was trying to defuse the situation, but neither of them were listening while clinging onto Mamoru's arm, and you and Kousagi were watching TV in the living room. A knock was heard from the door.
Usagi, out of curiosity, went over to open the door.