My Facebook friend Roger recently lost his father to Alzheimer's disease.
Was Roger really upset by the death of his father?
Yes, he found it difficult to deal with.
You should offer your condolences to Roger for the death of his father. It's polite to say something when someone loses a person close to them.
I will send him a heartfelt message to show him my sympathy.
Good idea, you should be there for him and do everything you can to make sure he gets through it. Even if you aren't that close to him.