Hi milkymc
first there are still a lot of McCormicks in the Inverclyde area
if you are looking to contact some of them the best way to do this
would be to put a bit in the Greenock telegraph with some of the details that
you know about your ancestors,
asking for anyone connected to your family to contact you
secondly
your family would probably be buried in the Port Glasgow Cemetery
if they still lived in the area
to find out you could contact
Inverclyde burial department (if you google you will get their email address)
if you know exactly when they died they should be able to tell you
which cemetery they were buried in
Good Luck

Elaine