Marmaduke de Thwenge
Marmaduke was born in 1225 in Castle Kilton, Yorkshire, England.  He died at the age of 54 in December 1279.

 Lucia De Bruce
Lucia was born in 1238 in Flamborough, Yorkshire, England.

 Marmaduke de Thwenge
Marmaduke was born in September 1256 in Kilton Castle, Sefton, Lancashire, England.  He died at the age of 67 in 1323 in Thweng, Yorkshire, England.

 Robert de Thwenge
Robert was born about 1262.