If you all would just honor the wishes of the persons house you are at there would be no problem. There would be nothing to hide. Its your choice to go there or not. If my relatives or friends set rules that I don't like I can honor those rules by either staying away or complying. Whats so hard about that?
My house is my domain, my house is carry friendly, I still appreciate it if a guest let's me know they are carrying. Other's homes may not be carry friendly, it would be best to let someone know, and allow them the choice to allow you to carry in their house.
Well, the nature of the email I received basically asked me to disarm myself anytime I was around the family. Because we do a lot of activities outside any of our homes, you can see how this would be some what problematic.