ANSWER:

If there are two or more men followers, they must stand in the next row behind the imam and the women must stand in the next row of the male followers.

If there is only one male follower then he must stand shoulder to shoulder to the right side of the imam in the same row. And the female followers must stand in the next row behind them.

If a boy is leading his parents in salah, where does the father stand? Next to him or slighly behind on the right? Since the mom is behind