I said in another thread this was well orchestrated Kate, Claire's Mom, Dan the lawyer Ben.
But was scoffed out
There is something odd about Claire's mom, her lack of reaction or didn't want to run and see her grandchild, that her daughter was alive.
Three years later she is getting settlement. No something is wrong! Aaron might just show up on the island.
I agree about it being rather odd that Claire's mom didn't immediately go down to see Aaron, or at least be waiting outside the hotel room door as Kate said her goodbye to him. It was also unsettling to imagine that small child sleeping all alone in that room...I imagined him waking up and being alone, crying for his "mommy", and nobody being there...

...And he's never met his grandmother, so even if Claire's mom DID later go into the room with him, just imagine Aaron waking up and seeing a strange woman sitting nearby! lol...Good lord, that would scare any kid half to death.
I don't think the writers thought that scene through well enough.