Father was 7 years old when Neil was born

Roger de Saint Sauveur, Seigneur de Cotentin Birth: circa 945

Father of Néel (Niel, Nigel) I (II) de Saint Sauveur, Vicomte de Cotentin, Birth: 953

Change dob of Neil to about 980 and then his father is 35 and Neil is then 36 when his son Neil is born.