Narcissistic family and birthday parties

I had planned a small-ish (just close friends and immediate family) birthday party for my 10 year old daughter. I figured my side of the family would come because this is a pretty big age milestone. 6 people from my family (narcissistic) side had RSVP'd yes, and my daughter was so excited. 3 hours into the party and no one from that side had shown up.

Thankfully my close friends came and we ended up having a great day. My daughter was asking where her family is. I was almost in tears and cried later when I was alone. Why does it hurt so bad, why do my feelings get hurt like this even after 30 plus years!! It feels so stupid.