Dreaming about my deceased grandpa and grandma?

My grandpa passed away three years ago when I was a freshman, I recently just graduated and it was a little hard that he wasn t able to see my accomplishments but the night before graduation I had this vivid dream about him and he was telling me how proud he was of me and it ended and then last night I had another dream about him but this time it felt real, very real to the point where I could literally feel his hands holding mine and I could see every detail in his face. He was healthy and normal again. We were talking but in our minds. We weren t speaking out loud. Later in the dream he gave me a big hug and I will never forget his face but he looked straight at me and said, this time speaking "goodbye pookies, I love you" but his face looked so relieved it literally looked like him like he was really talking to me and then he went away. My question is was that a visitation dream? And a follow up question: every time I have dreams about loved ones that have passed they always say they "have to go" I had a vivid dream about my grandma who passed 11 years ago. a while ago I had a dream about her but in the dream it was very vivid and again at the end she told me she " had to go" and I haven t had a dream about her since? I m just not sure where they "have to go" sorry it s so long I m just very interested in visitation dreams and getting answers! Thanks a bunch