Ruby I feel very strongly that when people become ex-JWs and their adult children leave, no matter how long that takes, they should apologise for raising their kids in a dangerous cult. My in-laws never apologised to my husband or his sister and I really think they should have.
It severely damaged their children's lives and they have never acknowledged that they, at the very least, made a dreadful mistake. My sister-in-law will no longer have anything to do with them which is very sad. Actually talking about this has helped clarify it in my mind. The next time I speak to my mother-in-law I will suggest it, it might help her get her daughter back.