You may have the urge to reprimand your loved one for forgetting things. That is a natural reaction, but it will not help. Instead, try to find ways to encourage them to go on and enjoy their day.
My Dad was diagnosed with Alzheimer's in 1995 when he was 64 years old. He was a successful businessman who owned a chain of grocery stores and had no time or patience for his children or their accomplishments. He worked seven days a week and expected everyone else to do the same.
He stopped driving at 65 so we knew something was wrong before the diagnosis, but he kept insisting that he wasn't sick, just tired. He would stay up until 3 am reading the Wall Street Journal on his computer and then argue with me about why I should be home studying instead.
"To be a caregiver for someone with Alzheimer’s disease is to be a caretaker and protector. We are their advocate, their cheerleader, their coach, and the one who comforts them when they are scared."
This quote speaks to the difficulties of caring for someone who is suffering from Alzheimer's disease. They need your help to do what they want or need to do everyday. This can be difficult if they are not a person who was responsible in the past. So as a caregiver you should try and remember that it takes patience and understanding.