Mullan family

[Jon_ni]

I just need to trace back and find his mother and fathers details.

To do that you will need to order a paper copy of his birth cert from GRONI, either using the online form, or by phoning them. They don't need all the info on the form ie the currently unknown mother's name to fulfill.
https://rootschat.com/forum/index.php?topic=849427.msg7168488#msg7168488
https://nidirect.gov.uk/articles/ordering-life-event-certificates

In addition the index only includes the first Christian name.

but the 50p Enhanced Birth index includes two and are what they seemed to reply by email with in response to a £7 phone request for a search, giving you the choice of then topping-up to purchase the cert [based on a marriage request].
If searching within the 100 years in person in GRONI or PRONI (or 1922-1925 from home) the Enhanced index can save you a fortune in views, has first & second fornames of child, mother and father eg if looking for a spouse's birth and there are several possibilities.
https://nidirect.gov.uk/articles/gronis-online-search-results

[liver007]

Thanks for that jon_ni