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I remember reading a book called A Monster Calls, which had the same thing going on. The original idea was from Siobhan Dowd, but she died, and the book was completed by Patrick Ness. I would do so...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/25889 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I remember reading a book called [_A Monster Calls_](https://en.wikipedia.org/wiki/A_Monster_Calls), which had the same thing going on. The original idea was from Siobhan Dowd, but she died, and the book was completed by Patrick Ness. I would do something similar: > Originally written by X. Completed by Y. I would have an afterword detailing the writing of the novel, and the parts you contributed to as well as edited to make the 'completion' more clear. I hope this helped.