Very thoughtful caring daughter.
My hubby two grow daughters rejected him after the ex told them, but the ex wife did it for revenge.
My daughters totally supported my hubby.
As far as everyone saying your mom should not have told you.....that is because in this community it is just how it is both have to be in agreement on who knows. That is where everyone is coming from/ many CDs have had such rejection and heartbreak from family members so know that is where they are coming from.
But i do like the idea your mom clueing your dad in to you being receptive and maybe also she could say you would keep your dads secret.
Best Wishes I think it will work out for both of you.
Just to add everyone is giving their opinion from their personal experience.....you asked and they are helping the best they can from their perspective and real life .