We have located the heirs of two HOLUB brothers?

We were searching for the HEIRS of two brothers with roots in the Czech Republic:

1. Jindrich HOLUB, born on 30.6.1905.

In 1970 he was residing at Galileo 2464, Buenos Aires, Argentina
and
2. Ing. Walter HOLUB, born on 9.11.1911.

In 1970 believed to have been residing at 16565 Goldenrod Place, Encino, 91316 California, USA

Their mother, Karolina HOLUB(ova) died on 20 April 1952

Their father Vaclav HOLUB died 12 Jan 1967

Can you guide us in any way?

If you have no information, do you know of anyone else, anywhere, where we can ask?
please e-mail me at searchandunite [at] lewinsdlondon [dot] org [dot] uk