hi @Ilovepenguins
We had an horrendous situation with my son's ex-wife that began in January 2021 and finally found a court resolution in June this year ... it broke both of us and cost approximately $180k to complete ... I'm not sure how we coped but the advice I can share is get a lawyer you can trust and involve a barrister in the process ... even though that increases the cost and is beyond many people's means, we had complete faith when they both said the court will uphold the right of the child to have a relationship with both their parents.
The lawyer continually reminded us that it doesn't matter if there's mental illness present, if there's drug use, if there is family violence, the court will always be negotiating for the opportunity to grant suitable access to the non-custodial parent. My son continually sabotaged himself all the way through and my ex-daughter-in-law was convinced she would 'win' as her mother is a lawyer who prides herself on fighting dirty but our lawyer had said, she (the mother) doesn't get it that family court is not a criminal court. She was subpoenaing everything she could, including my records, looking for 'evidence' that he was an unfit person ... aka a criminal. That's the joke, family court isn't looking for bad guys and good guys.
I hope that helps you - there is no 'fight' to win or lose, it's a discussion about the BEST INTEREST of the child. We had specialists involved, a child psychiatrists who offered the opinion that the mother was deliberately withholding the child, and an independent children's lawyer who interviewed and observed both parents with the child, and interviewed her as well, who submitted a report saying there was no risk to the child to be in the company of her father.
It was a soul-damaging and heart-breaking process but he now has regular access visits and a strong relationship with his daughter ... it was so worth it!! I'd also suggest, get a team of support people around you as it is tough and scary and painful and the hardest thing to do if you have to listen to the arguments against your child's right to be with their parent ... hold onto that truth!!