Your posting caught my eye, as my great great grandmother was a Watson. I don't think I am related to the John Watson though. Covington ,Ky is in Kenton Co. Ky, so I checked on this family for you, found very little though. John Watson (age 20)and Ada Watson (age 19) is found in the 1870 Kenton Co. census, living in the household with a Elizabeth Warren and a Earnest Warren (son I think) another Warren name that I can't make out. Elizabeth Warren runs a boarding house. Hope this helps some, didn't find either on in the 1900 census, but if you want, I will check at the library next time i'm there.