Mrs. Stevens's relationship with her son was terrible. He didn't show him much affection, never hugged him and got him a plastic chicken you hop around him rather than a Big Wheel.
Mrs. Stevens Sr. most likely had a good relationship with her husband.
As stated above, Stevens Sr.'s relationship with her son, Paul was a terrible one. She never showed him much affection and was apparently quite neglectful of him.
Nothing is known about her relationship with her daughter.