Baha’u’llah says about his own descendents!

And similarly, if the root of a tree be corrupted, its branches, and its offshoots, and its leaves, and its fruits, will be corrupted.

- Baha'u'llah

http://reference.bahai.org/en/t/se/PDC/pdc-21.html

Baha’u’llah referred to his children as "leaves" and "branches"