you asked for opinions so here it is: I agree with Illinois Marge. don't go. I'm sorry you are having a hard time conceiving. it must surely be painful for you to witness others' happiness so you'd probably do yourself and everyone else a favor if you didn't add a stressful shower to your worries. if you don't like the expectant father (your ex), look down on the grandmother-to-be and are jealous of the expectant mother, why would you consider going? if your DH must go since they are his relatives, send him with your scrapbook pages and go get a relaxing massage or something. since it sounds as if there's no love lost among you, they probably only invited you and your DH because you are related anyway.
~House on t-Hughsdays!~
Nothing is too wonderful to be true.