Need advice

OK my hubby and I have been TTC for over 3 yrs now.. No luck! 😢 his 15 yr old cousin just had a baby girl with his gf😑.. The problem is my husbands aunt is having a "meet and greet" in a couple weeks and we were not even invited and I think its because half of his family don't like me.. I'm not even sure as to what I've done to them but its really upsetting..we have been together for a long time but they don't even acknowledge me or him.. I feel awful that they are taking it out on him.. How should I handle this situation?