Your friends DC may visit there parents more often if they live quite near but there is the possibility your DS's GF may not be the one stopping him visiting on his own.
I do remember once DH and I were married, I was the one suggesting we visit his DM, so she actually saw more of her DS because of me.
Nothing I did ever pleased this woman, the reason, I had stolen her boy. DH picked up on this and sadly, in time, she saw less of him.
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