According to Wikipedia, Danny Kirwan married Clare E. Stock in Southend district in the June quarter of 1971. That year they had one son, Dominic Daniel.
The Dominic Kirwan of the mentioned website was born in 1960. Dominic's mother was Elizabeth (Lila). His father was John. Dominic's father and mother were married on the 4th of August 1958. His mother Elizabeth was very much a big influence in Dominic's early music career.
http://www.dominickirwan.com/about