A solicitor for an elderly man, who is "extremely ill" with cancer, has asked the High Court to help him find out what happened to his baby sister after she was born at St Mary's mother and baby home in Tuam.

Marian Bridget Mulryan is believed to be among almost 800 children recorded as having died at the home between 1925 - 1961.

Her brother, Peter Mulryan is extremely anxious to get whatever records exist concerning her, the court heard.

Mr Mulryan, 73, was too unwell to come to court, but his solicitor Kevin Higgins said he wanted Tusla to look at the material it had and see what happened to the little girl.

Mr Higgins said he wanted to know "did she die, was she trafficked or is she buried in the pit."

Mr Mulryan wants permission from the High Court to bring a legal challenge against Tusla, aimed at getting information from them about his sister.

The court heard she was recorded as having died in February 1955, nine months after her birth at the home.

Tusla said it had given Mr Mulryan any information it was aware of.

And it said it would facilitate inspection by Mr Mulryan of the material in its possession.

But Mr Higgins said Mr Mulryan was too unwell to inspect the material offered, the inspection offers were inadequate and the material held by Tusla should be forensically examined and catalogued with any relevant information given to his client.

The application has been adjourned a number of times to clarify exactly what orders were being sought on behalf of Mr Mulryan.

Mr Justice Richard Humphreys said the legal grounds for the challenge were "a bit thin".

The case was adjourned for a week to allow Mr Higgins to prepare further documents.