Parental alienation is when one parent tries to alienate the kids or turn them against the other parent. For example, one parent will talk about how bad the other is or whatever - the goal is to turn the kids against the other parent. It may start out small with little, innocent comments and adds up over time. Or maybe it starts big-time out of the gate.
I know my ex told my son that he needs to spend more time with her than me. And that's what he has told me - I don't ask what they talk about because he won't tell me. I just do the best I can and show them that they are loved and wanted.
Parental alienation is a terrible thing to do with a kid. It may also be in the form of telling the kids one of the parents did bad things to end the marriage. You get the drift.
There are moments in this life when you are so confident in the rightness of your actions, that not even for a second do you consider the option that you might be wrong.