Lord Marmaduke de Thweng of Kilton
Marmaduke was born about 1225 in Kilton Castle, Yorkshire, England.  He died in Helmsley, England .

 Lucy de Brus
Lucy was born about 1239 in Skelton, England.  She died in Gainsborough, England.

 Lord Marmaduke de Thweng of Kilton
Marmaduke was born about 1250 in Kilton Castle, Yorkshire, England.  He died about 1322 in Kilton Castle, Yorkshire, England.

 Margaret de Twenynge
Margaret was born about 1268 in Flamborough, Yorkshire, England.