Wilcoxon - thankyou. I had spotted the wills on line, however your message encouraged me to look into them further.
The first, Robert Ambrose, 1720, a widower, refers to a brother William. He also refers to a couple of other Ambrose, but I can't read the names nor do I know what relatives they are which is unfortunate. I can't see a reference to a John Ambrose, however part of the parchment is missing, right above the reference to his brother, so it is possible that John was mentioned in the missing section.
My ancester, John Ambrose, had his first child in 1730, therefore assuming he married around age 25 years, he would have been something like 15 when Robert wrote his will. It is possible either William or Robert could have been his father or a completely different family.
John, William and Robert are names that appear in practically every generation and in some cases, a child had two of the three names, so that matches (it goes down to my uncle today who is John Ambrose (2nd name) ......).
The will lists all the items to be inherited, really interesting to see that, though I have trouble reading it. It included 4 cows, a bull and a horse.
I have also read that John was born in Ireland and travelled to Bangor in 1715, so he must have been a child when he arrived. If Robert, who could have been John's father or an uncle, had come over at the same time, would he have had all the animals 5 years later? Though thinking about it, he is referred to as a yeoman, so I am not sure that means. The will also refers to a weak body, yet sound mind, that suggests he was of age when the the will was written, though it could be that he was ill.
I am not so sure about the 2nd one, I am unable to see it sufficiently

Doesn't give the answers unfortunately, just another piece of the puzzle