We're a group of cousins who live in the same city.
- I live next door to my sister.
- Across the street, four of my cousins live in the same house: a pair of identical twins and a pair of fraternal twins.
- Next door to them, three more of my cousins live in the same house: another pair of identical twins and their little sister.
- My brother, who looks just like me, lives alone way out on the outskirts of town.
Who are we?