'Extremely ill' man asks High Court to help him find out what happened to his sister who was born in Tuam mother and baby home

The site of a mass grave for children who died in the Tuam mother and baby home, Galway. Photo: Niall Carson/PA Wire

The High Court has been urged to help a man find out what happened to his infant sister after she was born at St Mary's mother and baby home in Tuam, Co Galway.