No parent wants to be at his kids funeral. I think any kind of light-heartedness would be out of place, unless it comes from the parents themselves. Its probably more OK if the person was old and their time was up anyway. Then its just an acceptance of the natural order of things.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma