Tripp - Secret?

 So why doesn't Tripp want to take a DNA test?  Is it b/c maybe he is NOT Steve's son?  And that would reveal it?  Ya know - I was hoping for a Sami/Ava showdown if they had a shared grand kid but since that's not where we are going I hope Ava is coming back to protect her kid.  I like T Braun and I liked Ava - but I'd also like to see a strong, rutheless female on this show that isn't about getting a man.  Let her want Titan and ruin Victor or something LOL... I dunno.  Maybe that's who Philip is talking to on the phone?