Every parent needs to think twice before bad mouthing the other parent in front of or within ear range of a child. A child has the right to love both parents and should not be forced to choose. Actions speak louder than words. Children will never forget don't let them live with regret in their hearts because of your own selfish unresoled issues.
"Listen earnestly to anything your children want to tell you, no matter what. If you don't listen eagerly to the little stuff when they are little, they won't tell you the big stuff when they are big. Because to them all of it has always been big stuff." Parenting Quote