Hi, what we have here is "Bonding", the aggression toward your sons, is because there his closest rival....He senses a difference in emotion you show to them then you do to others, adults. He's stakeing his territory, your his, period. This is to be expected from a Zon...This is Bonding, not Hormonal. Doing what Janet said and what your doing is fine, most likely, you'll have to keep you son at a distant from Diego, at least for now, and hope things calm down with time...Your sons might only be able to approach Diego with you out of sight.
The Days of Our Lives... Jayd
Note: In Janet's case, it's "Bird against Bird, a lot more direct.