As you will be aware, Ireland is currently at level 5 of Resilience and Recovery 2020-2021: Plan for Living with COVID-19.
At level 5, people are asked to stay at home as much as possible unless they have a "reasonable excuse" for leaving.
The Regulations providing for these measures are set out in S.I. No. 701 of 2020 and S.I. 29 of 2021. Regulation 4. of SI 701 sets out a non-exhaustive list of reasonable excuses for leaving one’s home. This non-exhaustive list includes at 4. (2) (p) move to another residence where, in all the circumstances of the case, such movement is reasonably necessary.
Statutory Instruments relating to the Covid-19 pandemic are available here:- https://www.gov.ie/en/collection/1f150-view-statutory-instruments-related-to-the-covid-19-pandemic/