I received this wonderful information from Lyle Rockwell....
As we follow Curtis & Polly from 1850 to 1860, all children including LeRoy & Milton were born to Polly. Matter of fact, LeRoy’s death certificate in the state of Washington states his parent’s were Curtis & Polly Blakesley Tyrrell. So since Polly didn’t die until 1861, I think we can assume Milton was the son of Polly & Curtis. Minerva didn’t come into the picture until after Polly passed away.
Source: Ancestry.com
Washington State Death Certificate
Name: Leroy M. Tyrrell
Marital Status: Married
Age: 85
Estimated Birth Year: abt 1853
Death Date: 17 Aug 1938
Death Place: Yakima, Yakima, Washington
Father: Curtis Tyrrell
Mother: Polly Blakeslee
Spouse: Marion
FHL Film Number: 2023565
Reference ID: 248
Census of 1850 Pike, Bradford, PA
Curtiss Terrill 38 CT
Polly Terrill 32 CT
Sarah Terrill 13 PA
Augustus Terrill 11 PA
Seth Terrill 8 PA
Frederick Terrill 5 PA
Meriam Waterman 80 CT
John Terrell 64 CT
Census of 1860 Pike, Bradford, PA
Curtis Tyrell 48 CT "Farmer"
Polly Tyrell 41 CT
Seth Tyrell 18 PA
Fred Tyrell 14 PA
Leroy Tyrell 7 PA
Milton Tyrell 5 PA
Ella Tyrell 4 PA
John Tyrell 77 CT "Carpenter"
Census of 1870 Pike, Bradford, PA
Curtis Tyrrell 58 CT
Minerva Tyrrell 37 PA
Leroy Tyrrell 18 PA
Emiline Cobb 15 PA
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All of the above easily traces back to Roger Terrell of Connecticut in the early to mid-1600s. I am very pleased to receive the information.