I like the one of your dad--the facial expression is and angle of the face. He's also not looking straight at the road, he is looking at an angle.
The 6th image of your mother is great. POV glorifies her. Maybe take a step back a foot or two to get the whole door and the feet in the frame?
The last image is my favorite. I like the lines and shapes, especially the way the lines on the bottom half of the frame leads your eye into the center. I'm not sure if this image is about form or if its documenting a space, which could be a floor or a ceiling? Not entirely sure but that is what makes the picture interesting.