should the grandparent get permission before showing up to see grandchild?

This isnt me but my friends step son. She and her husband (bio dad) have taken temp custody of the child because the mom is on methamphetamine and sells it too. the bio mom (junkies) dad has come down unannounced uninvited to pick the grandson up to take him up to his moms house for a few hours... a big argument ensued because the father of the child and my friend (the step mom) said no he cant take him anywhere but can see him at a mcdonalds or at their house he just isnt allowed to take him anywhere because they worry he will take the child up to the mom. is this right or wrong

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