Not sure how much I can help but I will do all I can.
I live in South Molton so not far from 'nanna's' birthplace, though I have been researching mine and other Irish descendant's families for a number of years.
Am I correct in thinking Mary Millicent's mother was Ann Tolfree?
Can you confirm your Dad's name, include surname if it is not Sharp.
As soon as I have this I will start hunting.