Hi Georgi, I found a Mary Allen and son, Benjamin Allen in the 1850 census for Smyrna, Kent CO. Delaware. I was told her husband was a Captain John Allen. At the time of the census, she was 31 and Benjamin was 12 I believe. They were included with the Benson Family, and thought she could have been the daughter of a Benson. Was wondering if you came across the Benson name in your research. Thanks.