I hope yoUr results are negative.
Things can happen, yes---I would hope the OP wasn't planning a lecture in manners or anything.
But sometimes, one reconsiders a relationship when things get too mechanical.
In my shoes---I have all sorts of things going on. This same family--I have extended grace numerous times. It is the thing with his family. No one ver intends to hurt us--they just forget us way too much. One year---the family had a gift exchange (drawn names) and it was 4 months before we got anything. It became funny because we figured they were too bust. We extended grace. The gift finally showed up, but only after the mother called. We didnt say anything to her. She just asked us, in person, about our gifts and we couldn't lie. The package arrived the following week.
Then there are the family get togethers where we don't hear about it until after the fact.
Or the lack of concern for my family....when we are going through tough times.
Sure---everyone is busy---we should extend grace.
But it doesn't make it hurt any less when you get brushed off especially when it turns out, there wasn't a really good reason in the first place.