Are the cousins still using inches?
Yes, still inches. How else would you remember 29.92 is the standard atmsosphere?
As cazatou suggests, Beer is still short measured in 16 fl oz pints, but that's largely academic because it all comes in 12 oz bottles.
Amazingly a mile is still 5,280 feet, but for some reason yards seem to have fallen into disrepute as unit of measure - and nobody has a clue what a meter(re) is, other than something for measuring electricity consumption.