Robert de Thweng , of Kilton, Sir
Robert de was born about 1255 in Kilton Castle, Cleveland, Yorkshire, England.  He died in 1284 in Kilton Castle, Cleveland, Yorkshire, England (dvp & dspm).

 Matilda Hansard
Matilda was born about 1259 in Yorkshire, England.  She died after 1284.

 Lucy de Thweng
Lucy de was born in Kilton Castle, Cleveland, Yorkshire, England.  She died in Guisborough Priory, North Ride Yorkshire, England.