How is Arthur characterized as a protective father figure?

Arthur Winslow is Ronnie's father and he does not doubt his son's innocence for one moment. He is highly protective of him, and is also extremely pro-active in his defense of his son. He knows that he is going up against the entire machinery of the British military but is not scared because he knows that he has right on his side. He puts together a good team for his son, hiring the top attorney available, and making sure to support his daughter in her defense of her brother. It is also interesting to note that he has raised a daughter who is a suffragette, and is supportive of her, showing that he is open minded and fair when it comes to equality, and equal opportunity. This is also shown by his defense of his son who is not being treated fairly.