I think Sean has contacted his grandmother via text message, early on, but in this interview, he stated, IIRC, that he didn't want to talk to grandma because it would make him too sad.
You have to understand, the grandma did a lot of damage to this child. She facilitated her daughter's abduction of Sean. She then facilitated her son-in-law keeping Sean from his daddy once the mother was dead. Most horrible, she was part of a campaign of parental alienation that was extremely abusive to Sean. That culminated in that horrible gauntlet they forced Sean to walk through to be handed over to his father. There was no need for that.
So, she is an incredibly dangerous person. I would not allow her telephone contact with Sean because I think the possibility that she would say subtle things, in a language I can't understand, to continue her campaign of alienation, would be high.
I would not allow visitation until she dropped the litigation. She has no right to continue this. I would then only allow supervised, therapeutic visitation. This child has been through enough.
He seems to be doing well right now. Let him re-establish contact when he is older and better able to protect himself.