I think it's scary that he sees this as "above and beyond." I visited several attorneys for free just to gather my facts. You have a son and a long term relationship. I think it's really, really important, for your peace of mind to get some legal advice. Better safe than sorry.
Again, that's just my two cents.
"You know, it's times like these when I realize what a superhero I am." Tony Stark/Iron Man
“Focus on what you can do, then do it with all your heart.” Lois Wilson