HUF of non-hindus

Since the word “Hindu” is part of it, only a person who is Hindu can have an HUF.

The word Hindu here has been used here in liberal way and includes the person of Jain, Sikh and Buddha religion. So a Muslim, Parsees, Jews and Christian can not have an HUF. 

An HUF can have four generation of descendents from a common ancestor as its members.

An HUF is creation of law and can not be created by acts of the persons

well said. The explanation is very clear.