I don’t see any confirmation in the OP that the sister is aware the poster hasn’t seen the child at all, so saying she’s insensitive is presumptuous for now. On the surface it’s odd that the great-aunt of the child would get a visit before the grandmother. As someone who was in a similar role as the aunt in the past, I would withhold judgement until the OP gives more detail. Seems as though there is a complicated backstory. We have an absentee father, a grandmother without a relationship with her direct grandchild, and an aunt with an open line of communication to her nephew’s child and his mother. Definitely not a cut and dry situation. Based on the very limited OP, the only clear cut victim here is a child who for right or wrong does not have contact with direct lineage family members. I hope the OP comes back to clarify the dynamics. Hard to give advice with only breadcrumbs.