Which Mughal married his own sister?

Which Mughal married his own sister?

None of the Mughal Emperors ever married their own sister.

What was the main focus of life of Zeb un Nisa?

Zeb-un-Nissa was a kind-hearted person and always helped people in need. She helped widows and orphans. Not only did she help people per se, but also sent Hajj pilgrims to Mecca and Medina every year. She also took an interest in music and it was said that she was the best singer among the women of her time.