No sooner do I say I can't find the Bastardy Record then it shows up. Here it is
Mother's Name: Zebedee Mary, St. George's Parish, Grosvenor Square,London
Father's Name etc: John Silvester, Heathfield Park, Nr. Uckfield, Sussex servingman. Male child born at Damerham on 20 February 1824
As for the dentist reference, no idea. I vaguely remember (about 2 decades ago) she mentioned she spoke with a researcher in England who found that out. She is trying to find that letter so I can figure things out
I think there is a very good possibility that the baptism is correct. I wonder if John was missing as there is no occupation listed for him
John Zebedee was born in Damerham which is in Hampshire. His mother born in Cranborne, Dorset. Both very close to each other.
I wonder where your aunt found the information that his father John was a dentist from Sussex