Heather,
Information is scarce, but here is what I have located.
First, I do not see a Mary Abrill married to a John Mead.
I do see that her father was Richard with mothers name unknown.
As for the Mead name. This family starts with Thomas, born in Essex England 1599 and d: 1628. He was married to an unknown woman and had 1 son William.
William was born in Essex England in 1625 and died in 1714 in Essex. He was married to a Sarah Fell born in 1643 in Lancashire Eng and died in Essex in 1714. They had 1 son,
Nathaniel, who was born in Bucks Co Pa in 1684 and died in 1760. He married an unknown woman in 1705. She was born in 1688. They had the following children:
John Mead b: 1693 in Cecil Co Maryland d: 1754 Bedford Virginia. Buried in New London Va.
John Mead b: 1696 in Bucks Co
Samuel Mead b: 1698 in Bucks Co
Robert Mead b: 1700 in Bucks Co
William Mead b: 1708 Lower Wakefield Bucks co

d: 1-17-1780 in Leesburg, Loudoun VA
Robert Mead b: 1710 in Bucks Co

d: before 1787 in Pittsgrove Salem Co NJ
Sarah Mead b: 1716 in Pa

d: ?
Pleasant Mead b: 3-1717 in Maryland

d: after 1787
Hope this aids in your search
maggi