I don’t think it is specific to your W. Mine has done similar removing or downplaying my presence for anything viewed as good or positive in the communal memory. I think it is just another tool in the WAS kit. As is digging for and accentuating every possible negative aspect of their lives with us. I have noted the affects of this on other family as it creates chaos and dissonance in their lives also.
It is best not to dwell upon it. These actions are owned by our WASs and as such so are the outcomes.
BITS Me 55, ACK, when did that happen? Doesn't feel like 55 D 30 S 27
You create your own universe as you go along - Winston Churchill