Conway of Rhodesia 20th Century

I am looking for details of living descendants of the CONWAY line who were living in Rhodesia, now Zimbabwe.
Known names include the following:

Peter Michael CONWAY (born about 1926)
married Daphne Barbara DOVE
son, David Michael CONWAY (born about 1958)

Other relations include:
Joan Kathleen CONWAY (sister to Peter), married LASSERTER / LASSITER?
Kathleen Marie CONWAY (aunt) [b.1898, South Africa - d.1968, Rhodesia] married John W. V. Peacock
Christopher Patrick CONWAY (grandfather) [b. about 1857, Ireland - d.1922, South Africa] married Mary Louisa BLECHYNDEN

Other names listed on family records - Mabel Maria CONWAY and Jacobus Michael CONWAY but these are listed on Catholic records which have not always had accurate spelling so there may be variations.

Trying to find out anything about this line and what happened to it. Names of Peter's parents, names of Kathleen's siblings (Christophers children), where any remnants of these lines are, etc.