The Vanir gods was an old branch of gods. The Vanir were masters of sorcery and magic. They are also widely recognized for their talent to predict the future. Nobody knows where the land, Vanaheim lies, or even how it looks like. When the war between the Aesir and the Vanir ended, three of the Vanir came to live in Asgard, Njord and his children Freya and Freyr.
Freya: The Goddess of Love, see Asynjur
Freyr: God of Fertility, see Aesir
Nerthus was the sister and wife of Njord, they had two children Freyr and Freya.
Njord: The god of the wind, see Aesir