No. It is unlikely to be in the children's best interest that they do not see their grandchildren and a court would order her to let you see the children as it is in their best interest to do so. Unless she can be persuaded to be reasonable you will have no alternative other than to apply to the court for a contact order.
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• Get a divorce
• Have contact with my children
• Make a small claim
•Write a letter of claim
•Obtain a Grant of Probate
•Get legal advice and help with my case
•Make a Will
•Change my Name
•Prepare a legally binding agreement
• Sever a Joint tenancy
• Prepare a Partnership Agreement
• Sell a Jointly owned Property
• Appoint a Guardian for my children