Wrongful death — Damages — Limitation — Parental immunity — Action by mother of deceased unemancipated minor against father’s estate arising out of crash of plane in which minor was passenger and which was piloted by father — Trial court erred in limiting wrongful death claim to amount of father’s liability insurance coverage — Parental immunity is not bar to wrongful death claim brought by son’s estate against estate of deceased father — Further, where both parent and child are deceased, stated basis for capping damages by amount of any existing liability policy is enfeebled by the absence of need to maintain domestic harmony