I submit from the Timeline of @Leofric II of Mercia:
871
Birth of Leofric II
Mercia, England
924
Age 53
Death of Leofric II at Devon, England
Devon, England
960
Age 53
Birth of Leofwine, Ealdorman of the Hwicce
Mercia, England
It would appear that @Leofwine cannot be @Leofric II's son, but possibly there is a missing generation (or two)?
