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Cto, or more correctly Cto, is the abbreviation for concerto.
It is the abbreviation when you refer to more than one Mister (Mr.).
There is no standard abbreviation in English for "cousins," because the word is so short that no abbreviation is usually needed.
Not that I can find -- and if an abbreviation is obscure, it is useless. More information: http://www.abbreviations.com/RESTORATION
In the south the spoken abbreviation is it'd i.e.; "It'd be better if you'd let Dad do that." However, it is more grammatically correct to not use this abbreviation in writing.
To answer this, one needs more information. Can you cut and paste the entire sentence where this abbreviation is used?
The word "Catholic" does not have an abbreviation. You may learn more about ecclesiastic abbreviations at the link below.
demodulator
The common abbreviation for "parents" is "pts." This abbreviation is often used in contexts like forms or notes where space is limited. Another informal way to refer to parents is "rents," although this is more colloquial and not a standard abbreviation.
Cos. is the plural, but more often used is the abbreviation for the word company instead which is Co.
PQ is not the abbreviation for any country. It is important to provide the correct abbreviation or context for a more accurate answer.
An abbreviation for accountant is acct. A certified public accountant is often referred to as a CPA which is one of the more common abbreviations.