I'd contact the Town of Limerick Clerk, www.limerickme.org/townclerk.html
and ask if he/she has birth records that old.
I'd also contact the Maine State Archives who has birth, marriage and death records prior to 1892.
If neither entity has that record, look for their marriage license. Both sets of parents names might be on it. If not, then look for their newspaper marriage announcement.
Last place is to look for Thomas's newspaper death notice. His parents names might be included there. Successful Searching!