A sister says that she prays with her husband since the Masajid are closed now. But he moves unnecessarily like scratching his head or something similar. He does not do this in every prayer, but he does it in some prayers. Also he recite very small Surahs .However he is the only male in our house now to be an Imam. What should she do ? Can she pray behind him or should they leave praying together ? Will her prayer be valid even if he does any action which invalidate the prayer ?