Rod ('kin') is the East and South Slavic personification of family, ancestors and fate, named in 11th-14th century Russian sermons beside the Rozhanitsy, the birth-goddesses who apportion a newborn's lot, and honoured with a meal and the child's first haircut (postrizhiny). Some scholars, above all Rybakov, make him a creator god at the head of a Slavic pantheon; others, including Klejn and Zubov, deny he was ever a deity rather than a personified concept, and he is absent from Vladimir's 980 pantheon. Much of his modern 'supreme god' profile comes from Rodnovery and from the forged Book of Veles, not from the medieval sources.
Modern Practice
Rod's practice is ancestor work: a place at the table, bread, cheese, honey and mead, the naming of the dead, and the first haircut of a child given to the kin. It is addressed to the line rather than to a person, which is why it sits closer to household religion than to temple cult.