Programming Forums - Interpolation

I was learning hashes and one part has really confused me. I think that i may have misunderstood the concept of interpolation.

I wanted to print a value in the hash table so i used the code:

print "$family_name{$given_name}\n";

what I would expect however is the code to be as followed:

print "$family_name{�$given_name�}\n";

As i am referencing the value of the variable �given_name� rather then the variable itself; thus i would expect the double quote marks so that the variable is interpolated (
and the value of the variable is used in the expression ).

I hope that this makes sense. I will be happy to clarify any points that are unclear.