That's correct. Buster and Betty are married and their real life son plays Bono.
Cathy = his real life wife
Maria = his real life daughter
Buster = his real life son
Bono = his real life grandson
Dermot = his son's lifelong best friend
Winnie = his real life sister
Betty = his son's (Buster) real life wife
Trevor the missionary = his daughter's (Maria) real life husband (and producer of the theatre shows)
Sharon = wife's (Cathy) real life sister
And Rory is a long time friend, and agent
Mark and Grandad have both been with Brendan O'Carroll for about 20 years.