Grandcha - in what language is this?

"Grandcha" is not a word in any widely recognized language. It's possible it could be:

* A misspelling of a word like "grandpa", "grandchild", or "granola".

* A regional slang term in a specific area.

* A made-up word for a fictional character, place, or object.

Without more context, it's impossible to know what "Grandcha" might refer to.