Should I confront her about this?

My kids dad and his mom came in to town for Christmas and only saw his first two children and not the two we share together.They brought them gifts and spent time with them and didn't even reach out to the kids we share together.I will say I do have him on child support and the other mom doesn't have him on support. He currently lives out of state with a new woman but comes in town for holidays. It just ticks me off that they act like he doesn't have other kids here and the kicker is me and the first mom don't live far from each other. His mom doesn't even acknowledge that they're alive. It makes me sad for my kids that they care nothing about them. Should I reach out to his mom and tell her how I feel? When we were together she would bring things for our kids when she came into town now that we don't get along she acts like they don't exist and she hasn't even met our daughter that we share together which is really sad! They look like spiting images of the first two kids. She also did this last year as well. So should I confront the grandmother or leave things as is? Also I've reached out before and she ignored me.