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.

 Isabel de Roos
Isabel was born about 1256 in Igmanthorpe, England.

 Lucia de Thweng
Lucia was born in Kilton Castle, Yorkshire, England.