Learning your mother or father has a cognitive disease such as Alzheimer’s or another dementia is a very scary and overwhelming situation.
You probably feel frustrated that things seem out of your control. You might feel that your own life is being taken from you. Maybe your relationship is suffering when it needs to be flourishing.
You don't need or deserve the guilt associated with these feelings.
Wouldn't you rather feel confident, in control, and have the peace of mind that you are doing the best for them?
You can, but the complexity of the disease should not be underestimated. Eliminating environmental triggers to reduce undesirable behaviors, will help them stay safe, happy, and engaged at home.
This may possibly slow the progression, and allow you to better enjoy your time together.
But it takes special planning and implementation.