christhelawyer : HiWelcome to JustAnswer. My first response will follow shortly. Please feel free to follow up if anything is not clear
christhelawyer : There are 2 ways to sort this out. The first would be to set up mediation with the daughters, where you could meet, with a family mediator, and try to resolve the issues, both over the arguments, and the contact with the grandchildren. This could take place in a safe and confidential place where you can all talk freely but try to reach a positive result.
christhelawyer : This would be fairly easy to organise, and you would not need lawyers and costs, except for the mediator, who often charge fairly modest fees.
christhelawyer : As a grandparent you can apply through the Family Court for permission to apply for contact. This is not as easy as parents, but can be done. The disadvantage is that going to court may really divide the family further, and make further contact very difficult, with no guarantee of success.
christhelawyer : This would also involve paying for a lawyer which could make this an expensive exercise.