Hi,
You may review the following based on information posted in INIS Website. Hope it helps.
http://www.inis.gov.ie/en/INIS/Pages//U ... in-Ireland
UK Nationals coming to live in Ireland after 31 December 2020 and their Non-EEA family members:
There will be no change for UK nationals who wish to live in Ireland after 31 December 2020. Their rights under the CTA will continue to be protected.
A new scheme will be introduced for UK nationals who come to Ireland after 31 December 2020 and wish to bring their non-EEA family members. Details of the scheme will be available on this website shortly.
Please continue to check this website for more details in the coming weeks.