I was in my grandparents house and heard my brother talking to someone in the bathroom and I was thinking. Who is he talking to? And I walk in there and he is talking to my grandpa who passed away 20 years ago and I ran to him and gave him a hug
Based on this dream, it seems like you have a strong emotional connection with your grandfather who passed away 20 years ago. Seeing him in the dream may represent your desire to connect with him or feel close to him again. The fact that your brother was also there may indicate that your family members also share this desire to connect with your grandfather and may hold similar memories or feelings towards him. It's possible that this dream is a representation of your own longing for closeness with loved ones who are no longer physically present.