West African families could have hundreds of members because many believed that all people had what is a common .

Ancestor

Explanation:

It would make sense that the answer is 'Ancestor'. For all the tribal conflict that goes on in West Africa, they still hold family dear and can relate with those in their tribe quite well no matter which country they are in.

This is most probably due to their belief that humans have a common ancestor and so we are all related. It would make sense therefore to allow many people into your family because they are already your family.

answer; ///approx///5,000 miles;