Is it wrongful termination if my boss fires me because our kids don’t get along?

You did not specify whether you have an employment contract or not, but assuming that you do not, you most likely will be unable to sue your boss for wrongful termination if he fires you. As a general matter, employment in the U.S. is employment at will. This means you can quit whenever you would like, and you can get fired for any reason that is not illegal. 

There are some exceptions to employment at will.  For example, civil rights legislation including The Civil Rights Act of 1964, The Age Discrimination Act of 1967, and the Americans with Disabilities Act of 1990, set forth prohibited reasons for firing an employee. However, while this Civil Rights legislation states that it would be wrongful termination to fire you on the basis of your race, religion, gender, national origin, age or disability, civil rights laws do not protect you from being fired because your boss doesn’t like you. 

If you have an employment contract, the answer may be different. Your employment contract may specify that you have to be fired “for cause.” If this is the case, unless you have done something wrong, it would be wrongful termination for your boss to fire you because he does not like you. If you have an employment contract, you should consult with your human resources department and/or an employment law attorney about your situation.