As little folk, one grandmother went NC with us for a decade (adult siblings rowed, and she picked a side and NC'd us), and the other refused to ever show her face at our school even in dire emergency. Not a Catholic primary school, you see, so completely beyond the pale.
As a result, when the other kids started picking on us for our failure to produce any grandma at Grandparents Day, school show etc, we hit on the idea of simply claiming they were dead. We were never asked about it again, problem solved.
After I went to a high profile (Catholic) secondary and started winning national competitions of one sort and another, both began suddenly telling all their friends of this magical granddaughter and one demanded (not asked, demanded) tickets to various school events.
Which culminated in me saying "it will be hard for me to ask school for a ticket for granny, because you see, I told them she was dead"
The moral of the story is, please be supportive of your grandchildren. We really notice it when you don't notice us