I copied these things down at one time to help me better manage my changing relationship with caregiving to my loved one. Perhaps they will be helpful.
When frustrated, remember to take a deep breath in and out and counting to six before speaking.
Agree, never argue.
Divert, never reason.
Distract, never shame.
Reassure, never lecture.
Reminisce, never say remember.
Repeat, never say I told you.
Do what they can do, never say ‘you can’t.’
Ask, never demand.
Reinforce, never force.
When asked, always say something positive about the situation.

I don't care for the use of the word “never”. Perhaps “resist the impulse to” is better.
A big hug to you all. We are not in this alone.