Birthday

I’m so upset. My daughter turns 1 next Thursday. I invited all of my SO family(daughter has different dad)and out of 13 total people only 4 is coming from his side. Total her party is only 10 people. Bought all these decorations, rented a center.. for 10 people. His family still plays the card of “well she’s not blood related so I’m going to don’t care about her.” I got back together with him when I was 10-12 weeks pregnant? Am I stupid for even having invited them? Dumb for feeling this way?