Was francis bacon natheil bacons brother?

Bacon had an older brother, Harley, two younger sisters, Ianthe and Winifred, and a younger brother, Edward.

Yes, he had a brother named Anthony Bacon.

There is a possibility, as they had the same last name. Also, people in their day tended to marry relatives. However, since Roger Bacon was a monk (Monks didn't marry), it would have been hard.

No