Sara -
Please do not be afraid of this dream. Caskets are associated with death, yes, but death takes many forms. It is essentially a letting go, and not necessarily a physical death. The dream is important for you because it has come to you more than once. Repetitive dreams have a stronger significance that a dream that comes to you nly one time.
The man in the dream gets up and walks up to you. He has information for you. Your Higher Self is tryng to bring some information to you. My feeling is that in your dream this man symbolizes someting else, or someone else, in your life. Who does he remind you of, or who/what do you connect him with? Could this deam be about his nephew, the gentleman that passed away? Could the nephew be tryng to bring sme information to you?
Ask for a dream to clarify this dream. Before you go to sleep, ask yourslef what this dream means. Then just go to sleep. You should receive a dream that explains things for you.
You are going through changes in your life - and they are good changes. :)
Blessings,
Bonnie