* This is a very private family. They might not have any public presence online or in any records.
* You may have misremembered or misspelled their names. A slight difference in spelling could make it difficult to find them.
* They are fictional characters. Perhaps you encountered them in a book, movie, or other work of fiction.
To help me find more information, please tell me:
* Where did you hear the name "Colbert and Joyce Croft"? (e.g., a book, a family story, a news article)
* What else do you know about them? (e.g., their age, location, profession)
With more details, I might be able to help you find them or discover who they are.