Can we sue for loss of parent?

I'm sorry for your loss of your dad.  No matter the age, we are never ready to say good-bye to them. Children have a cause of action(s) for the loss of their parent(s).  You will want to talk to a lawyer who handles this type of case.  You will want to provide the following information: 1.  The location of their vehicle if you know it, 2.  A copy of the police report if you have it.  3.  Any names of witnesses you may have or others who have information about what occurred.  4.  The name of the hospital your parents were taken to.  5.  The name of all the biological and/or adopted children of your parents.  6.  If you have any pictures of the vehicle(s) in the accident (post accident) that would be helpful.  7.  There are many other things to provide, but for now, this is a start. Most lawyers who do this type of work will give a free consulation.  My firm gives a free consultation either on the phone or in person.   I hope this gives you a start in your efforts to investigate what you should do.