Sorry- this wont help you OP, but anyone else reading this, please talk to your parents now about what they would like. In fact, talk to your DCs when the opportunity arises about what you would like yourself. It might sound morbid, but we have all discussed burial/cremation etc and in time I will write things down. My father did this for me.
He wrote a letter about 10 years ago, like this-
Dear Downton,
I am sorry to have to write to you like this but needs must,
It went on to list his funeral arrangements, the policy number he had taken out to pay for it, the hymns, what the male voice choir should sing, church, burial plot deeds, a poem he wanted reading etc.
He signed it with his full name, not "Dad" which made me laugh as it was so like my dad to be formal. He gave it to me about 6 months before he died and it was marked "to be opened in the event of my death."
It helped so much as I did not have to do, or think, about anything, other than letting people know and set the ball rolling with the insurance policy etc.
I think I would have got things wrong without his plans to go on as i would have been doing it for me, instead of him, IYSWIM.