Husband leaving for Japan when my Nana is sick

So we had been planning this trip for a year. My step son moved to Japan because he was having trouble healing from trauma down here and he really loved Japanese culture. We honestly didn't think he was gonna stay down there and saved money to bring him back but he's happy down there. My husband and him play two hours a fortnight every night together. It's their way of spending time together. We were all saving for a trip to Japan this summer to see my step son but I just found out my Nana is sick and most likely gonna pass away soon. She raised me when my mom was in and out of prison on drugs and was there for everything. I'm heart broken. I spoke to my husband about postponing the trip until next summer so I can say my goodbyes to my Nana and be with her and my husband said why doesn't he just go and me and the kids can say goodbye. I was hurt and asked why and he said it's been a few years since he's seen his child in person and he doesn't want to cancel on him. We haven't seen him in person because he decided to pack up his life and move to a different country. My husband says he's tired of only being able to connect with him for two hours a night and when he watches his tiktoks on what it's like to live in Japan as a foreigner. I told him I understand but we can all plan to go next year. He said we all can go next year but he's going this summer. He doesn't want to wait another year. Am I wrong for being upset. 1. He doesn't want us ALL in Japan with him and 2. He's willing to leave when me and the kids will be sad about our Nana. He will also be gone for a few weeks too. Am I in the wrong here?