Hugh III de Montfort was born circa 1078 to Gilbert van Gent (c1048-1094) and Alice de Montfort-sur-Risle (1050-1090) . He married Adeline de Beaumont-le-Roger (c1092-) .
Children
| Name | Birth | Death | Joined with |
| Alice de Montfort (c1127-1162) | 1127 | 1162 England | Robert Noel (c1120-1151) |
Siblings
| Name | Birth | Death | Joined with |
| Felia de Gaunt (c1070-?) | |||
| Emma de Gaunt (c1071-bef1135) | 1071 Folkingham | 1135 Bourne | Alan de Percy |
| Henry de Gaunt (c1072-?) | |||
| Ralph de Gaunt (c1074-?) | |||
| Hugh IV de Montfort (c1078-?) | 1078 | Adeline de Beaumont-le-Roger (c1092-) | |
| Geoffrey de Gaunt (c1080-?) | |||
| Matilda de Gaunt (c1082-?) | |||
| Robert de Gaunt (c1084-?) | |||
| Agnes de Gant (-c1134) | 1085 | 1134 England | William FitzNigel (-1134) |
| Gilbert de Gaunt (c1086-bef1094) | |||
| Alice de Gaunt (c1088-?) | |||
| Walter de Gaunt (c1092-1139) | 1092 | 1139 | Mathilde de Penthièvre (c1098-1135) |