personally i wouldnt text or call him, go see him face to face. there's something about telling someone off in person that is much more effective than email/text. here's what i would say...
hey assjockey! whats the deal with imposing yourself on my little girls special day!! what the fuck is your problem!? didit ever occur to you that she just may be a little stressed out emotionally and financially!? hence the "no kids" decision!? what part of that do you not underfuckinstand!?
listen up real good you ratfuck asshole! if i even see your slimy ass at my girls wedding i'll kick ur ass so hard you'll be wearing it for a hat!!
thats what i would say, but thats jus me :)