It's common to include family members in dreams. They are the support system we all need to get through life.

Vehicles usually symbolize our passage through the journey of life. The way that you travel through your life's journey, and your effectiveness in controlling your life.
The type of vehicle will give indications of the type of experience being related in the dream message. For instance, an ambulance will indicate a need for healing in the giving and receiving of experience, a police car will signify the need for discipline in experiences, an old car might suggest old habits, or 'things the way they used to be' or the need to change the old way of doing things...etc. A van may suggest that you have a lot of room in your life for others, or that you carry around a lot of 'extra baggage'.
Your ex doing tricks with the dog suggests there is something about him that 'amused' you and you may be missing that from your current relationship. Because of the dog though, it also suggests that there may have been a loyalty issue with your ex.
The elderly in dreams usually represent patience, wisdom and experience.
Black is the color of the subconscious, of sinking into the darkness, or mourning. Black is masculine; it is the color of night. Black stands for limitation, hidden things, despair, depression, things that are considered 'taboo', conservatism, old age, melancholy and sacrifice(the giving up of things to make you, or someone else happy), your shadow (an aspect of your personality that is hidden, unknown and/or repressed within your subconscious mind).
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Do you feel that there is something missing from your current relationship?
Do you feel that you are sacrificing something to make others happy?
Are you still carrying around the old hurts and memories from your past relationship?

Hope I could hep. Best of luck!

You're welcome!

You need to take time out for you. Take care of yourself first, then try to help others.Sometimes we just need to learn to tell others no.
Hugs, and hope,
J