Fathers we are all
Some of us with many
Some of us with one
Our children vary in appearance even more than we
But helpers they are to one and plenty
A few of us knew our calling
A few others knew our vision
And yet a few more knew our path
But fathers all gave birth to their children
Clarification
The answer I'm looking for is who are the fathers, you can give the children if you like but it's not necessary.
Lines 2 and 3 refer to the number of children certain fathers have.
Hint 1:
The fathers are not specific to a particular time. There have been countless throughout the ages.
Hint 2:
The fathers are alive while the children are typically not considered to be so.
Hint 3:
The children do not die, but they can be destroyed.
Hint 4:
The children can made from almost any material. Be it plastic, glass, metal, cloth, cement, rubber or some other material.