The place name Mountmellick, and individuals named Ann and Henry (a sister and brother born circa 1790-1800),appear in my data.
However,I have no evidence of any children of Ann Deverell including the child you named Joshua Deverell Smith in your message. I have no information for Deverells who went to New York state
Based on the above, there is no doubt in my mind we are talking about the same family. I just don't have enough information to conirm relationships of individuals. If you have more names and relationships, it could help and be mutually beneficial. I look forward to hearing from you again.
Best wishes,Ruth Still, Orangeville, Mono Township, Ontario, Canada