He had at least five brothers. Four were killed in battle, when Madara was still a child. He also had a younger brother, Izuna Uchiha.
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No, Obito and Madara have no relationship or connection with each other. Izuna is Madara's brother whom he takes his Mangekyou Sharingan from to gain his Eternal Mangekyoi Sharingan.
it had to be the sage of six paths or the 1st or the 4th or madara;s old body or his brother
No, uchiha sasuke is not madara, however, madara is either uchiha itachi's grand or great-grandfather. Therefore, sasuke is madara's grandson or great-grandson.
Yes, Madara is in Sasuke's family tree. Madara is Sasuke's great, great, great, great, great, great, great, great grandfather.
If I am correct, Sasuke is his great great (etc.) nephew or grandson. But you should check another website first, because I'm probably wrong. :3 Hope this helped! :)