Hey y'all. Like many people here we had to postpone our big wedding due to COVID. We are now planning a tiny ceremony and reception (we invited 17 people total) for our original date and then celebrating next year. The tiny celebration includes both of our immediate families (parents, siblings, my two nieces) and 8 close friends including our officiant and his wife. My question is: I have 3 half-siblings. I am not close to any of them and they're all approximately 20 years older than me. We did not grow up together and have had infrequent contact. I found out from my parents that my half-sister has been asking them about the wedding date and wants to be present, but if I invite her I feel like I need to invite my other half-siblings and their families, which would be an additional 13 people, effectively almost doubling our list. My dad seemed shocked that I didn't want to invite her, saying "you aren't even going to invite your half-sister?!" Is it cold-hearted to tell them it's immediate family only (my full brother and his family)? If so, any suggestions for how to tell them and how to assuage hurt feelings? They're all invited to the big celebration next year.
Thanks for your help!