Dear Nikola,
a) Thank you for your letter.
b) As you know, I consider family relationships to be very valuable, and would like to help you to respond to Uncle Rob's request in such a way as will strengthen your relationships to him, to your mother and to your brother. 
c) As I wrote previously, I believe the instrument with which I can most efficiently help you is the telephone.
Please call me at your convenience.
Stay content and happy.
I have been well.
EJM