Answer:
Parallelograms and Rectangles
Sides: Both have 4
Angles: Both have 4 angles but a rectangle has right angles.
Relationship: A rectangle is a parallelogram but a parallelogram is not a rectangle.
Parallelograms and Squares
Sides: Both have 4
Angles: Both have 4 angles yet a square has 4 right angles
Relationship: A square is a parallelogram however a parallelogram is not a square.