I am looking for information on my great grandparents Timothy Reardon married Cora Crouse in Rockland, Maine & had three children, Helen, Francis and Louis Reardon. Louis moved to New York City and had family members who moved to Australia

Have you attempted to get their marriage certificate form Maine?
I should have the info on where they were born, age, and parents.

I found him in the 1870 Census for Rockland, ME:

John - 60 - b. Ireland
Mary - 35 - b. Ireland
Mary - 11 b. ME
Timothy - 10 b. ME
Ellen - 9 b. ME

I found another Timothy Reardon who is 34 in 1860?

What year did he get married?

Timothy J Reardon married Cora Crouse Nov. 24,1892 in Rockland, Maine