Before anything I would get them checked up by the Vets just to make sure they are healthy
Other reason for them behaving in this manner is
Change of environment that has caused them stress which is leading to this inappropriate behavior
Cats love routine and if their routine changes this triggers stress
Think about it, from having a daily routine and everything being the same to now a sudden change
What you can do is
Try give your Cats their own space to help them get used to their surroundings, maybe your bedroom? And keep them their for a while and then gradually introduce them to the rest of the house
Give your Cats more affection and love.. Give them attention and reassurances that everything is going to be okay
Talk with your Cat, stroke them, pet them, this will calm them down
I would recommend reading this article
catloverhere.com/2018/06/28/how-to-calm-a-stressed-cat-down/
Got some great advice and tips on how to calm a stressed out Cat down
Hope this helps and all the best
PS - Patience is key here because it may take time