The woman who first found Markendaya in the hospital was Grandma Bone.
It makes sense. The woman was described as having a 'face like a bad stone', and grabbed the Time Twister from Mark as if she knew what it was. Plus, her actions and dialogue were very similar to that of Grandma Bone or even the Yewbeam Aunts.
Mr Pilgrim was one of the men that Yorath Yewbeam impersonated in Castle of Mirrors