I'm glad you had a positive Easter.. and although things got tense with S17 it was a good thing to get the feelings out there. Most men have much difficulty discussing their feelings and hurts.. so your young man (S17) likely wasn't really addressing these for himself. Thankfully your brother was there to help the 2 of you in your communication.. and hopefully this will allow you and your S to grow closer.
And as for your comment about DBing techniques. I agree that I am more aware in all interactions now that I've discovered these techniques.!