Help me get my son to be aloud to lay his 6 week old son to rest

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His ex partner has got a court order stopping my son from going to his sons funeral to be about to say his final good buy to him my son his totally heart broken from the death of his beautiful son who suddenly died 6 weeks ago we still do not know what caused the death he gets buried on the 18th April so not long and we have tried everything please help and sign and share