WHERE IS MY biological father-Ronald Reginald Wilson or Underwood? All I know is he is about 59-60 years old?

Maybe he is in N.Z, He played in a band in St.Kilda Melb.about 42 yrs ago.Maybe a nick name of Reggie, Maybe Ricki Mae's cousin? He comes from N.Z...I dont know anything more. Any-one with any info would be greatly appreciated. I'm his daughter. Thank-you