Here's the list of the noble families in the game with all their members, if you wanna join one of those families please ask the other members first. the characters mentioned as NPC are Non Playing Characters nd they are up for adoption.
Arryn
Head of the house: Robin Aryn (NPC)
Xane Arryn
Cassandra Arryn
Baelish:
Head of the house: Alyssa Baelish
Baratheon
Head of the house: Philip Baratheon
Miguel Baratheon (Philip’s cousin)
Irri Storm (Miguel’s bastard daughter)
Bolton:
Head of the house: Cato Bolton
Odette Bolton (Cato’s sister)
Juliana Stark (Cato’s sister, Proteus Stark’s wife)
Cerwyn
Head of the house: Amelia Cerwyn
Clegane
Head of the house: ??? (NPC)
Ishizu Clegane (daughter of the head of the house)
Coltress
Head of the house: ??? (NPC)
Teegra Coltress (Khal Draeko’s slave)
Dayne
Head of the house: ??? (NPC)
Belina Dayne
Thomas Dayne
Frey
Head of the house: ??? (NPC)
Obelisk Frey (Basilisk’s twin brother)
Basilisk Frey (Obelisk’s twin brother)
Greyjoy
Head of the house: Naveen Greyjoy
Sinbad Greyjoy (Naveen’s brother)
Lina Greyjoy (Naveen’s sister)
Hyblaia
Head of the house: ??? (NPC)
Megara yblaia
Karstark
Head of the house: Lyanna Karstark
Urduja Karstark (Lyanna’s daughter)
Innis:
Head of the house: ??? (NPC)
Kian Innis
Melea Innis (Kian’s daughter)
Lannister
Head of the house: Phoebus Lannister
Rose Lannister (Phoebus’s daughter)
Madeline Lannister (Phoebus’s daughter)
Olena Lannister (Phoebus’s daughter)
Daemon Lannister (Phoebus’s cousin)
Cale Lannister (Daemon’s son)
Greta Lannister (Daemon’s second wife)
Artur Lannister (Phoebus and Daemon’s cousin, Alice’s twin brother)
Alice Lannister (Phoebus and Daemon’s cousin, Arthur’s twin brother)
Laufeyson:
Head of the house: Loki Laufeyson
Mallister:
Head of the house: Ulrick Mallister
Martell
Head of the house: Soma Martell
Akhesa Martell (Soma’s sister)
Kocoum Sand (Soma’s cousin)
Opal Sand (Soma’s bastard sister)
Montmayeur
Head of the house: Reth Monmayeur
Dymas Montmayeur (Reth’s uncle)
Lily-Rose Montmayeur (Reth’s cousin, Dymas’s daughter)
Irima Montmayeur (Reth’s cousin, Dymas’s daughter)
Tristan Montmayeur (Reth’s cousin, Christian's twin)
Christian Montmayeur (Reth’s cousin, Tristan's twin)
Mormont
Head of the house: Jeor Mormont
Anne Mormont (Jeor’s wife)
Garrett Mormont (Jeor and Anne’s son)
Cedric Mormont (Jeor and Anne’s son)
Jane Tully (Jeor and Anne’s daughter, John Tully’s wife) - DEAD
Eilonwy Mormont (Jeor and Anne’s daughter)
Damian Mormont (Jeor and Anne’s son)
Nita Mormont (Garrett’s wife, Meera’s daughter)
Of Ghis
Head of the house: ??? (NPC)
Tya of Ghis
Khanrah Wormdor (Tya’s son)
Ramsay
Head of the house: ??? (NPC)
Tarn Ramsay
Reed:
Head of the house: Robert Reed (NPC)
Meera Reed
Nita Mormont (Meera’s daugter, Garrett Mormont’s wife
Greta Lannister (Meera’s niece, Daemon Lannister’s wife)
Rothburh
Head of the house: ??? (NPC)
Louise-Annette v.Rothburg
Targaryen
Head of the house: Marina Targaryen
Amalthea Targaryen (Marina’s sister)
Kida Targaryen (Marina’s cousin) - DEAD
Jim Targaryen (Marina’s bastard cousin)
Zevran (Marina’s dragon)
Tyrell
Head of the house: ??? (NPC)
Sarahae Tyrell
Anastasia Tyrell (Sarahae’s niece)
Tudor
Head of the house: ??? (NPC)
Ryan Tudor
Tully
Head of the house: Tycho Tully
Caollaidhe Tully (Tycho’s wife)
Eric Tully (Tycho’s brother)
Adam Tully (Tycho’s brother)
John Tully (Tycho’s cousin) - DEAD
Jane Tully (John’s wife, Jeor and Anne Mormont’s daughter) - DEAD
Jeannie Rivers (Eric’s bastard daughter)
Stark
Head of the house: Proteus Stark
Juliana Stark (Proteus’s wife)
Kayley Stark (Proteus and Juliana’s adoptive daughter)
Robin Stark (Proteus and Juliana’s son)
Giselle Snow (Proteus’s bastard sister)
Vane
Head of the house: ??? (NPC)
Mako Vane
Vaith
Head of the house: ??? (NPC)
Zuko Vaith (brother of the head of the house)
Voss
Head of the house: Tulio Voss
Dothraki
Khal: Draeko
Jasmine (Draeko's sister)
Kale (Draeko's son)
Tzipporah (Draeko's dughter)
Teegra (Draeko's slave)