Per his wishes, I cremated Dave. Part of Dave will join part of Mom and part of Dad in my back garden. (To be specific, I'd say it's 2 cups of Mom, one cup of Dad. I'll make sure that Dave doesn't overwhelm them.)
After Mom died I followed most of her directions: I amended her last name on the headstone, then I sprinkled some of her cremains on the plot, dug up some of Dad's ashes from her garden, and mixed hers and his for my garden. So now part of Dave will join the mix.
Only part will stay with the family, because per his wishes, I divvied him into baggies for his AA friends to put in their gardens "to help things grow."
Let me tell you, while it may be practical to distribute ashes among friends, and relatives, and friends you love more than relatives, Dave's friends do not necessarily relish the responsibility of a baggie o'Dave. Maybe they think it's gross, or maybe they think he's out there expecting them to take him to Europe or something. I was surprised how taken aback they were by the suggestion. Eventually I found one sympathetic ear and gave him a dozen baggies of Dave to distribute how he saw fit. Will it happen? Who knows?