This one I bought at Home Depot a couple years ago.

This one I'm not sure if its an Easter, Thanksgiving, or Christmas cactus or if those are all one in the same?
Thanks,
Jessie

No one?

The only one I can help you with is your first. I have the same ones and was told that they are called Cereus Repandus/ peruvianus. Hope this helps! You're last one will be kind of hard when until it flowers but wait I do remember someone talking about there being a post that tells the difference between the three maybe you can try searching in the tool bar on this forum for say "distinguishing between Christmas cactus, etc., etc. there was someone just talking about the same thing on here a week or two ago. Good luck! :)