Not sure we have a matchup although there appear to be a few coincidences.:-(
The Robert Womersley and Eliza McKee in this forum were married in Rock Island, Illinois 25 Nov 1859.We aren't sure how Eliza got to Illinois, but we do know that Robert (well documented of Freeport PA) traveled out to marry her as her family may have moved to Illinois but we believe they were living in Freeport PA for some period of time--it appears all James John McKee and Mary Ann Crawford's children were born in Pennsylvania circa 1834 to 1849.So this doesn't sound like the same family.Plus, my James John McKee and his wife were definitely Irish immigrants as well documented in Eliza's census records.
In later life, around 1900 Robert and Eliza lived next door to their son-in-law David B. Gow and daughter Mary A Womersley (this is the Gow forum, just paying my respects :-) and this family appears in the 1900 census in South Buffalo Twp, Armstrong Co. PA (down the road from Freeport PA).
Sounds like you are related to an interesting clan of McKees...thanks for sharing.