Sorry folks, but Albert S.and Joseph E.Johnston were NOT related (unless the connection was far back in time in Scotland somewhere). I did quite a lot of research on this since I am gg grandson of Lt. Col. Thomas Henry Johnston (CSA, 1st MS). His family came from VA and he was born in KY. Wanted to be related to either or both of the famous generals, but found no connection between my line and their lines or between their lines.
The closest link I could find was that Joseph E. had a relative also named Thomas Henry Johnston who was in CSA (cav. from Botetourt Co., VA) at same as my Thomas Henry Johnston; and as if to just confuse the matter, the one in VA married the 4th cousin of the one in MS. But other than that; no connection.
Interesting that Joseph E. Johnston is related to Patrick Henry, of Revolutionary war fame.