The correct answer to this open question is the following.
Unfortunately, you did not include the story of the grandmother’s house, so we do not what you are specifically referring to. However, we can help to comment on the following.
I suggest pro-Columbus Day people make peace with the pro-Indigenous Peoples’ Day folks once, and definitely. What happened is related to 500 hundred years ago. Both sides should have the humility and tolerance to accept the fact that what people need today is union, not division. It is a time to celebrate Native American history, tradition, and heritage, and admit the fact that the arrival of the white Europeans had its purpose -good and bad things happened- but it is time to move on in peace and tolerance, trying to build a better future rather than to inhabit in a bitter past.