What is the simplest way in which two people can be an uncle to each other?

Question

It is quite easy to place four coins in such a way that each penny touches every other one. Just place three of them on the table in the form of a triangle so that they touch one another, and then lay the fourth coin on top of this triangle - as shown in the following figure on the far left.

Now add one more coin and try to do the same thing with five coin - again every coin has to touch every other.

Answer 1

When they are unknown to each other even seems to be quit aged people.

Comments

If they are of same age, then how can they both are uncle to each other.