There is a huge flaw with your argument, which is that most of the time there are two parents and the other parent can and often does undermine our relationship with our child. Gaslighting. Manipulating. Telling lies about you.
My estranged child’s other parent was verbally, emotionally, financially and physically abusive towards me prior to our divorce. They got custody and I was increasingly boxed out of visitation while my ex made a point to keep my child in touch with my mother and siblings. My Ex’s intent was to have me isolated and estranged from my family as well.
You are gaslighting people by telling them that they are responsible for their own estrangement.