That elder is way out of line , whether you consider it from a normal human aspect or even the Watchtower’s own guidelines.
“Necessary family business “ is the phrase used that allows interaction in these circumstances, plus common sense although some of them don’t have that.
On the better side, I have seen a couple of WT deaths in which the rules were relaxed to allow a d/f child or grandchild to be there and to mingle with us - until after the funeral anyway.