Searching for ancestors of John Knox or children: Hugh Knox, b. 1807; John Knox, b. 1810; Mary Ann Knox, b. 1812; William Knox, b. 1823 and Robert Knox, b. 1827, living in County Derry / Londonderry County, Ireland. The sons, John Knox and William Knox emigrated to Philadelphia, Pennsylvania, USA. I have their family lines but I would like to find ancestors still in Ireland that have family line of the Knox family remaining in Ireland.