Bumping this message, hoping to catch anyone's attention. :)
I'm now fairly sure that David Myers b.1803 isn't the father of these two brothers, and that Catherine (I don't know how or where the surname 'Workman' was found) was the mother. A widowed Catherine Myers and daughter can be found in the 1850/1860 censuses living with Philip. I cannot establish a father, as he would've passed prior to the detailed 1850 census. The link I supplied in my last post suggests another 'David Myers' (couldn't be 1803 David) died in 1847 and left an inventory of estate. Unfortunately, I can't get the woman offered for reference of this inventory to answer any correspondence.