from what I can tell, this particular forum isn't always the best for getting replies.
I don't have similar circumstances, but I'll toss in my opinion. if this is just something he was spouting off to your daughter, I'd let it be and ignore it until you hear something more definite either from him or--hopefully not--a lawyer. given his history, it doesn't sound like he'd go that far out of his way to push for this.
M60 H52 D20 M14 yrs OW-old gf from 1986 bomb-5/18/08 H filed for D-9/10/08 D final 4/24/09 xH remarried (not OW) 2012