Genealogy / Looking for Zdzisław Kowal [2]

Hi,

My mum is looking for her brother and my uncle Zdzisław Kowal.
We live in Melbourne Australia and have lost contact with him several years ago through moving.
We left Poland in 1992.
He is the son of Eugeniusz and Aniela Kowal
He is around 60 years old and is probably living in Warszawa and has a son named Sebastian.
If anyone knows of this person can you please contact me.
Would be much appreciated.

Thankyou.