This is not a normal family, at all

This is a story of kids that all got adopted when they were younger. However the parents who adopted them died in a car accident two years ago. None of them are blood related but they still coincided themselves brothers and sisters. They were all pretty successful some more then others, some at a younger age, but they live a crazy entertaining life. They never knew why their parents names them after the days of the week but they all shared the same last name, Allin.