In 1967 my uncle, Theodore Frederick Poulson, wrote a history of our family beginning with my great-great-grandfather John Poulson, born 1819 in Betws-y-Coed, Wales. John was married to Elizabeth Ellis of Hastings, England. Daughter Mary was born in Hannover in 1844. John had left Wales or England to become the estate manager for the king of Prussia.- c.1843-85. My great-grandfather was John Frederick Poulson. Siblings in addition to Mary, were George, Sarah(Sally) and Charles. Great-grandfather John Frederick came to the US at the age of fourteen and became an apprentis to a dentist in New york. He married Mary Quinlan.They had three children Frederick John(my grandfather), George and Marie Estelle. There is much more if you are interested.