[Bloody Sam Roberts]

Not so. Family in American English is singular.

Careful. You'll chance slicing your finger while attempting to split such a fine hair.

[em2vn]

Not at all. Proper usage is proper usage. Would you say the same thing about; tyre for tire, gaol for jail, queue for line as in line up, boot instead of trunk as in car trunk, lift instead of elevator. The first floor in a British building is what we call the second floor.
It is endless.