I know for a fact that Samuel Alexander immigrated to America. I am a decendent of his. He was born in 1657 in Northern Ireland. He died in Cecil Co., MD in 1733. I donot know about his siblings though. Like you I cannot find anywhere that Rev. James was their father. Everything I find says that William Alexander was their father. I believe Rev. James was a cousin as well. What is your direct bloodline? How are we related cousin?