If your agreement states that that the renters are required to share a kitchen and/or bathroom with you, and you are the owner, then the tenancies you have with them would seem to be exempt from the Residential Tenancies Act under Section 5 (i). As such, you do not have to give a reason to terminate a tenancy.
Unless you have a written contract with the renter that specifies the amount of notice that should be given if either party wants to end the tenancy, you should give an amount of time that matches the frequency for rental payments. If the renters pay by the month, you can give 30 days’ notice to end the tenancy.
Here is our fact sheet on shared accommodation for further information: https://landlordselfhelp.com/media/2024-Sharing-Kitchen_Bathroom.pdf
Please remember that once you move out and if you choose to rent to tenants who are not required to share kitchen or bathroom with you, the protection of the Residential Tenancies Act becomes immediately effective for those new tenancies.