My DH’s stepmother made it impossible for us to attend his father’s graveside service (at least she allowed a priest) and was rude to extended family in the bargain. We had the priest in the area where my FIL was raised say a Memorial Mass, and had a family reunion, though a sort of somber one, after the Mass. It helped closed things for my husband.
His mother died in May, and his sister did not inform us. His mom claimed to be an atheist and wanted NO services, but was baptized and confirmed Catholic. Because my husband was deathly ill in February, we haven’t had time to breathe, let alone catch up on this. I think after Christmas in the dead of Winter we will request a Memorial Mass for her.