Idk if i should attend my family dinner for thanksgiving tomorrow??

so Theres this "family" friend lady and her daughters that sometimes celebrate thanksgiving and christmas with us every holiday, and i dont like them at alllll and neither does my mom lol the daughter,  shes my age and i grew up with her but she changed since high school , she thought she was better than me at everything and acted COCKY. she still is cocky and were 22 years old. I dont really like going to family gatherings sometimes because they always go and are so damn noisy and brag about everything.. Should i just go though ? me and my boyfriend? I mean all my family is going so if i dont go, i wont eat anything for thanksgiving..... 😐 i just dont like her!! and she has a baby now and a husband so im kinda jealous but i dont care cuz shes not BLOOD. Should i just go and dont talk to her? and brag about my life? hahaha How can i ignore those people tomorrow??? 😭