John A. Kernan was the brother to your Peter, I believe.I have no proof of this, however they and William A. (John A.'s eldest son) all enlisted in the Civil War at the same time.Also my William A. and his brother John C. had a Carpentry business in Jax around 1878.John A. Kernan came to American from County Wicklow, Ireland (I searched for YEARS for this obit - where I got this info from) when he was 15 years old (around 1830).John A. Kernan married someone named Elizabeth C. (unknown last name) in PA because their first three children were born in PA - the last three born in Jax.I have been unable to find them in PA, but would love to find out more on them.John A. Kernan died in Jax 30.Mar/1899 and is buriedin St. Joseph's Cemetery in Jax.I can send you photos of William A. Kernan and John A. Kernan (his Dad) if you wish, along with family group sheets for them. I know nothing about your Peter, Martha and Mary other than what I already told you.That information was in my notes from my last trip to the Jacksonville Historical Society. I am in DeLand, FL (just outside of Daytona Beach) about 1 hour from Jax.Let me have your snail mail and I will get this information out to younext week.Reply directly to me at email@example.com Thanks.