the date of the deed is 1647 don't be confused by the year it passed thru the court 1665 - often deeds were held by the family until some event (eg death, marriage) that might require it to be registered - the law changed in 1704 requiring all property changes to be recorded in the rolls office.
Sometimes 'the younger' is used to distinguish between two children with the same Christian name but also used when two individuals with some but not straightforward family relationship needed to be distinguished