A lot of things are called discrimination in the US these days.
Justice is rendering to each their due. In justice, you have to pay to render to the people what their are, in fact, owed. The question is: do people deserve to make enough to earn what is necessary to raise a family? And does a single person deserve -due- the same wage?
You seem to be arguing for a pay differential based on the size of an employee’s family. That is, if an employee has a family to support, then he should be paid more than one who doesn’t. So, to take the prior example of Julianna about a General Schedule job in the Civil Service: two employees doing the exact same job, one single, one with ten kids. The one with ten kids should be paid substantially more in order to support his family?
There may have been some support for that sort of idea at one time. I mentioned previously that my first employer did actually pay married men more for the same job than single men.
But now, whether in civil service or in private employment, it would be entirely illegal to do so. The EEOC, the NLRB, the Justice Department and a few other agencies would be all over such an employer imposing draconian penalties. There would be lawsuits and big settlements.
Also, one has to remember that wage payments are income to the employee but an expense item to an employer. All expenses have to be recovered in prices if any employer is to be profitable. And if expenses including wage expenses increase, so will prices. Rising prices hurt consumers and make it more difficult for the poor to live.
However, another way to equalize things for those with dependents is to greatly increase the dependency exemption and the child care credit. Those have never kept up with inflation.