If humans land on Mars, will the descendants of humans fight against their ancestors on Earth?

Maybe.

In short, human nature has bad roots. The weak will eat the strong. Those who naturally immigrate to Mars are elites with good physical conditions. If humans on Mars develop to a certain level, resources will be scarce and the population will increase. According to human nature, I think the greedy people may invade the earth, but if the earth can control the Martians, they may live in peace, and they must be of the same root and species.