Isaac Hempstead Wright indicates to EW that Bran must decide whether to share this information with his brother or not, but really, that’s the least of his problems at the moment.
Before he wrestles with how he’s going to tell his brother he’s the heir to the mad king, he has to get to him first.
Season 6 of Game Of Thrones showed Bran and Meera just narrowly avoiding death thanks to the help of Hodor and the Night’s Watch uncle once believed dead, Benjen Stark.
Thanks to his powers, it is revealed to Bran that his bastard brother, Jon Snow, is actually his cousin, the child of Ned Stark’s sister Lyanna and her kidnapper Rhaegar Targaryen.