How many movies have Mavis Staples and Roebuck 'Pops' Staples acted in together?

They have worked on 3 movies together! Their first movie together was The Psychiatrist: God Bless the Children (1970) while their highest rated movie together was Let's Do It Again (1975). They have not worked together since Let's Do It Again (1975). They are most known for their crime films together.