What countries made up the Central Powers at the start of WWI?

Germany, Austria-Hungary, Bulgaria, and the Ottoman Empire.

Explanation:

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.

your mothers brothers brother in law would be your father.