As a child, we mirror the behaviours of our parents and if there is a toxic relationship between our parents, it's bound to indirectly be part of our socialization process which would only come out visible when We grow up and start building our own relationships.

Many of the rape cases or domestic violence we see today was because parents could not hide their bad behaviours in front of their kids and their kids grows and start seeing such behaviours as a societal norm.

If parents fight violently in front of their kids, their kids are bound to emulate such behaviour when they grow up because socialization starts with the parents and once the parents do that in front of their kids without due recourse to the fact that their kids are watching and mirroring their behaviour, the kids would eventually see it as a normal behaviour and would take that mindset to their relationships when they come of age.