Grandad.

Hi, just looking for some advice or personal experience my grandad has dementia and alzheimers, he used to be a social butterfly and talk with everyone but lately he has been cutting everyone off. He will speak with me multiple times a day which doesn’t bother me I enjoy our chats, but I have people contacting me looking for him, and I make excuses to why he doesn’t answer is this normal behaviour? I’m not pushing him to speak with anyone but he has a massive fear of these people ringing or contacting him or rocking up to his house. Just want to know how I go about this situation as I would like him to feel as comfortable as possible, I should also add he has cut off his 2 daughters im the only family member he will speak with. thank you.