When adult children turn their backs on their parents, express a hatred for them, unless there are real grounds that could be presented in a court room, therapy might be useful.
Might, because the child has his ‘whole life’ based on a fiction which he can’t let go.
Parents who are confronted by the hatred of the adult child, who are accused of all sorts of offences they know nothing about, who have their actions misinterpreted or are condemned for imaginary, events need to be aware and strong.
The parent who can say to the adult child; “Alright, you want nothing to do with me, I’ll go,” protects him/her self from further abuse, and gives the child the Pyrrhic victory.
In some cases the child will, on his own, speak to someone gaining therapy. Perhaps, reflection might be enough for them to contemplate the reasons and, perhaps, recognise and admit, their error.
If the adult child moves for reconciliation, the parents are never to mention or discuss the past. Further, they must maintain a scepticism as in many cases this is a ruse to bring the parents back into range.
If the child makes no attempt, then the parents are protect from abuse.