He might be the Harrison Benjamin Morrison who was born 4 Jul 1913 and died 9 Mar 1992 in Mohawk, Greene County, Tennessee, although nothing in the online records definitively ties Harrison Benjamin Morrison to this family.
He doesn't appear to be with his parents in this census, based on the order the children are listed. Note that the ages of the oldest children are well below what they should be, based on the 1910 and 1920 censuses.