Guys, don't say we do not listen and ignore every person who has said, and I repeat, words to the effect of.
OF COURSE LOSING GOOD GRANDPARENTS DAMAGES CHILDREN. SAID GRANDPARENTS THEN GOING TO COURT DAMAGES THEM MORE THOUGH.
Solicitors will tell you that, organisations related to the courts will tell you that and child psychologists will tell you that. Also you are almost guaranteed to lose because parents are considered more important than grandparents which is as it should be. So all that stress and upset and financial loss for nothing.
Your arguments while understandable and coming from the heart do not change that. If you cannot save and stabilise the relationship with your adult children, no matter whose fault the estrangement is. Then you are never going to have a good relationship with those grandchildren, just forced contact for a few hours a week, probably supervised in a contact centre which is expensive, awkward and distressing for everyone, you, your children and your grandchildren. Eventually you might get to take them out on your own terms, but then you have handovers that are distressing for you, your children and your grandchildren.
People have tried to explain this to you kindly and people have gotten frustrated and explained it unkindly. It doesn't change the facts though. The courts aren't going to entertain this unless the circumstances are exceptional, like you literally raised said child for a period of years.
Thinking you are right is not enough to change the law because as much as you push for it, parents are going to push back. Child welfare organisations are going to push back. Checkmate.