Did some looking around on Family Search and Ancestry and found a couple interesting tidbits with regard to Daniel Coffill's family.
In 1863, two Coffill girls, Prudence and Ann, were passengers on a schooner bound for Boston that was captained by a D. Coffill.
The girls' ages were given as 23 and 18 giving them birth years of approximately 1840 and 1845. The 1840 date corresponds nicely with the birth year for Daniel's daughter, Prudence.
The Ann born in 1945 is interesting and I have a theory to throw out here: is it possible that the Ann Coffill who accompanied Prudence to Boston could be Charlotte A. Coffill (the A could stand for Ann) born to Daniel and Rebecca (Huntley)? Her unsourced birth date was 1850 and caused problems with there being a ten year gap from their marriage to her birth. An 1845 birth would narrow that gap.
I also looked at Daniel and Rebecca's son, Alfred and came across something interesting that was sitting in my own database. I'm not sure there was an Alfred born to Daniel and Rebecca or if there was, his birth year may be incorrect. The Alfred I had was b. 1853, the same year as William Coffill (Daniel's brother) and wife Phoebe Pickles had a son, William "Alfred" Coffill. This Alfred married Mary Hardacker in 1874. I had two children assigned to Daniel's Alfred but upon looking at the birth registration for the oldest, Norman (b. 1876), his parents are given as Alfred and Mary Hardacker. The 1881 Census also shows the other son I had assigned to Daniel's Alfred, Harris (b. 1879) living with William's Alfred along with Mary and other son, Norman.