Tristan Wren is a supporting character in Star Wars Rebels. He is the son of Ursa Wren and Alrich Wren.
He was the only one of his family to warmly welcome Sabine back home.
Tristan was first referred to in the episode "Trials of the Darksaber," where Sabine mentions that everyone turned their backs on Sabine when she turned against the empire, including her brother.
He was unfortunately one of the casualties of the "Purge of Mandalore" along with his parents, which left Sabine devastated and one of the reasons she stayed on Lothal.