Can fear-based parenting lose power (expire) when we're grown ups?

So instance I'm currently living (but only temporarily) with my parents and will soon be moving to the US with my husband and our son.

As an adult, mother and wife, I've verbally stood up against my father on a couple times he was unfair. I recently called him out when he was verbally antagonizing my mother. He felt resentful and gave me the cold shoulders but realized that wasn't working anymore. I wasn't going to back down and apologize just out of blind obedience. I used to fear him during my childhood and youthful years. Not anymore. He's much older, shrinking and a lot weaker. My younger brother doesn't fear him at all. Now, I speak up my mind and don't back down for anyone. I'm no longer that quiet, obedient young woman from the past anymore.

Does does this fear-based compliance he raised both my brother and me have an expiration date eventually? Becuase if he tries it now it's not going to work at all.

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I can now honestly say that neither me nor my brother fear him anymore. I'm not afraid to speak my mind and call it wrong when it's wrong.
Can fear-based parenting lose power (expire) when we're grown ups?
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