What would Buddha advise to farewell when one of your parents died?

Perhaps some Buddhists will say death doesn't really exist, but in any case, when your parents die, there is something changed. What would Buddha teach to say goodbye to your parents. Probably all kinds of feelings may be there and that is good, but worry a lot wouldn't be very advisable. But is it 'advisable' to feel joy or sadness. For short, how to say goodbye when someone close to you died?