At home, always barefeet. Even if I don´t have carpets at home (they´re a nightmare to clean).
Ah, and for the question.... in my country, most families don´t care about using shoes inside their houses. I personally don´t like it and when I have guests, I always provide them some flip-flops or slippers.
If I visit someone and the person/family offers a slipper, I´ll gladly take my shoes off.