Hello there - good to hear from you. So your great grandfather William Mellon is brother to my great grandmother Jane Mellon who married Charles Martin? If this is correct, I'm afraid I don't have a lot of info on Jane or her parents or any further back. I haven't done any FH for a while, but would love to have another search in Ireland. The John Wiley b 1827 that I suggested was given as Matilda's father by a Rootschat person, and they said they'd got the info from a Baptism, but I was never able to track this down.
I do know a little about Jane and her move to Scotland with five children, then another four then her death at just 42. I don't have a single photo of her. I'm in touch with several first cousins from this (my dad's) side of the family - some in Scotland, others in Ireland. None have any further info or photo of Jane.
Would love a photo of your family. I am so nosey to see ANY family traits!!
June Mitchell nee Martin