Thank you so much for posting the names and births of Horatio Alexander's children. With such precise birth dates it looks as though you might have access to a family Bible. Is that the source of the information? Do you know who owns the Bible now?
Do you know who the daughters of Horatio married? I think it is interesting that in the 1850 San Augustine County, Texas census that Horatio has a five year old girl named Amanda Cartwright living in his household. I wonder if Horatio's daughter, Amanda b. 1822, could have married a Mr. Cartwright. I know that there were some other Cartwright children living nearby - but they were reputedly the children of Hezekiah Cartwright and Nancy Grissom. After Hezekiah died, Nancy m2 Henry Curl with whom she and her children were enumerated in 1850.