It is permissible for the husband to lead his wife in prayer and the wife should stand behind the husband, because it is not permissible for her to stand next to him.

If women pray in congregation, then the one who is leading them should stand in the middle of the row, because that is more concealing, and a woman is required to cover as much as possible.

You should not delay ghusl after having sexual intercourse with your wife in Ramadan so that you can pray Fajr with the congregation in the mosque.