Sir Thomas Hoo married Isabel, daughter of John St Leger, in 1335: by this union the manor of Offley St Legers, Hertfordshire, came to the family. They had connections with St Albans Abbey, to which they gave an altar-frontal cloth embroidered with the Hoo and St Leger arms, and were buried there. Their son Sir William Hoo (1335–1410) married Alice, daughter and coheir of Thomas de St Omer (of Mulbarton, near Norwich in Norfolk) and his first wife Petronilla (Pernell) Malemayns (whose father Sir Nicholas de Malemayns, of Ockley, Surrey, outlived her and died in 1349). Petronilla's sister Beatrice, wife of Otho II de Grandison, is commemorated at Ottery St Mary, Devon.