It seemed they liked the same type and characteristics of a man. The two did notice John, the most popular guy on campus but they thought this guy was oblivious of their presence. Thus, Diane found the silent Dennis more to her liking. Dennis reciprocated Diane's attention and they began dating. This made Janice anxious and a bit jealous, more so, when the men she liked didn't court her.
Later, when Diane and Dennis' relationship turned serious, when she was head over heels in love with the man, Janice became closer to Dennis and calling it 'sisterly' love. This made Diane uneasy and her perceptiveness was quite accurate.
"I do wish you girls would settle your differences," said Rose.
"It's settled, Auntie," Diane said bluntly.
"But Janice's your first cousin. You've been close since you were young."
"I hate to say this again, Auntie. Not anymore."