It has been claimed that Grace Newton was the daughter of John Newton and Mary (Allerton) Newton, Mary being the granddaugter of the Mayflower passenger. But more recent Mayflower data says that Allerton-Newton descent has been disproven.
It may be possible to confirm family relationships with Grace by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Grace: