Things to consider...

From 1860:
1860 United States Federal Census about John Costello
Name: John Costello
Age in 1860: 40
Birth Year: abt 1820
Birthplace: Ireland
Home in 1860: West Stockbridge, Berkshire, Massachusetts
Gender: Male
Post Office: West Stockbridge
Value of real estate: View image
Household Members:
Name Age
John Costello 40
Catharine Costello 35
Ellen Costello 4
Thos Costello 18
Daniel Costello 10
Michael Costello 9/12

A Daniel was born in 1850, to parents John and Bridget...
https://familysearch.org/pal:/MM9.1.1/FXCJ-SGV
I'm struggling to find a death record for Bridget.

In 1855, John is married to Catharine, the mother of Ellen (and Michael)...
https://familysearch.org/pal:/MM9.1.1/MQ4L-93W

Here is a marriage record for John Castello and Catherine Donahue, of West Stockbridge...
https://familysearch.org/pal:/MM9.1.1/NWBV-5NC

It gives you the name of the fathers at least. Thomas might also be worth tracking as he could be a brother of John. Finding a marriage might net you a mother's name, for example.
John