There's some very confusing and contradictory information on the Griffiths and Musgraves (Mugrove) Quaker lineages who came from Ireland to Chester Co Pennsylvania 1682 and after.
MYERS, Albert Cook, Immigration of the Irish Quakers into Pennsylvania, 1682-1750 has seemingly very contradictory information. Is this source considered generally accurate? I don't use it a lot. Written 1902 and appears well footnoted but some citations are genealogies of an earlier era.
WT has Ann Griffith m to Jacob Marshall in 1718, Ireland. Ann b abt 1697 parents are believed John Griffith and Esther Musgrave but their marriage is documented New Garden (PA) MM minutes as 1728. This is only possible if Esther is a second marriage for John and not the mother of Ann.
Ann's father John Musgrave is believed to have arrived from Belfast 1682 indentured to Valentine Hollingsworth (I will check the Hollingsworth Register). John should be Penn Project once I get his profile reworked (currently has zero info).
Could someone with FindMyPast access check its Irish Quaker records for John Griffith having an earlier wife? Finding that would solve most of the issues I see with these lineages. I don't know Myers' source but he thinks John came 1729 (contradicted by the 1728 marriage document) with a son Christopher which also points to a first wife possibility.