Employees are presumed to be "at will." At-will employees may be terminated for any reason—at any time, even a mistaken reason, they can have their hours changed or pay decreased and they can suffer a cut in their benefits, so long as it's not illegal or unlawfully discriminatory. Generally, employees who work under an employment contract can only be terminated, or have significant changes made in their work conditions, for reasons specified in the contract. In your state, an employment relationship is at-will unless there is a defined duration for the employment contract or if the contract permits termination by the employer only under specified circumstances.
Unlawful discrimination would include an employer discriminating based upon a person’s Ethnicity, Color, Religion, National Origin, Gender or Disability.
If you believe that you are presently being retaliated against based on your wage claim of a few years ago, then you may sue the employer for the disparate treatment based on their obligation of good faith and fair dealing---arguing that they give the accommodations that you seek to other parents---but not to you.
I would suggest that you retain a local employment law attorney to assist you in dealing with your employer in this instance---in part because the claimed retaliation involves something that happened several years ago---and gives the employer the ability to argue that your allegation simply is not correct. However, the change in hours, the denial of accommodations routinely granted other employees and the failure of raises all seem to point to disparate employment.
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I wish you the best in 2013,