As a kind of follow-up to Dorothy Colleen's book find:

I read and enjoyed this book several years back: Cemetery Boys, by Aiden Thomas
https://www.amazon.com/Cemetery-Boys-Aiden-Thomas/dp/1250250463

And with https://en.wikipedia.org/wiki/Day_of_the_Dead and related observances coming up, I'm hoping your library has/can get it for you.
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PS: Don't buy. It's good for a read-once, and tagged teen/young