The Williams' mailbox has their name printed on the side facing the front of their house, where it is least likely to be helpful to any delivery person. Hopefully the occupants who have the best view of it are aware of their own name.
Parents watching TV special on Alaskan Wilderness. Yes they have Eskimos, Polar Bears. But no, penguins are only an Antarctica, South Pole, animal.
The mailbox outside the Williams family house reads "The Williams". The correct plural for the surname "Williams" is "Williamses". Saying "The Williams" would be correct if their last name was just "William".