You got adopted by a wealthy family but it turns out they already 7 sons

You were driving to your new home with your new parents. You could tell you hit the jackpot by just their car, they were very rich but they were also very kind and humble. The car parked outside a luxury mansion, it was very very big, you couldn't even believe if it was real or not. You got inside saw you butlers, maids, cooks, everything! The inside looked very luxurious too. Your new parents gave you a tour around the house and when you guys went to the enterance again you saw 7 handsome young looks boys looking at you from the mezzanine balcony.