Matt has a little sister named 'Mary' they surprisingly had a decent relationship with each other, since their age gap are 8 years apart.
Meanwhile with Matt's older sister, named Millie.They didn't got along with each other, since she was 12 when Matt was born.
Their relationship was a bit complicated since Millie dislikes Edd. Nobody knows why she dislikes Edd. However the feeling is neutral with Edd and Millie.
Edd also dislikes her-
