Dream of deceased, girlfriend, grandfather

I dreamt this about a month after my girlfriend s grandfather passed away and in the dream I was in a park that i know very well and have been in many times. The dream is very vivid and life like and I could feel the wind and hear the birds. As I approach a narrow little pond which is in the pond I notice my girfriends sister standing on the other side with her head down looking at the water. She kept vanishing then reappearing again. As I got closer she stopped vanishing and looked much younger then she actually does now (like 10+ years younger). As she looks up and turns around, my girlfriend s deceased grandfather is now standing behind her looking at me. As she turns around she now blocks him from me and he is now looking at her. He says only two sentences in English (he doesn't speak English at all by the way.) He says you are not weak, you were always strong. The dream ends but reoccurs two more times in which the sisters clothes and hair keep changing and in the last one my old deceased family cat appears, walks by, and then the dreams end completely, and i never had it again.