It never said if Obito was his ancestor, but we can assume not since Obito had no other family besides his grandmother, and Madara may or may not be related to him but he was dead, so 0.
Nah she's just lava style and fog or mist style I forget what she calls it. She has 2 kekkei genkai and they are fire earth and I believe fire and wind.
"Bitch you couldn't kill anime Elsa the fuck think you can lay a finger on me"