Petty behavior could mean a few things other than emotional immaturity. It could be a way to regain control, seek attention, or mask deep-seated insecurities.
A woman appeared to check all three boxes when she tried to manipulate her daughter-in-law into adopting her skewed views on mother-son relationships. After failing miserably, she became vindictive and spiteful, forcing her son to throw her out of his house.
She continued with her childish antics, which ultimately poisoned what was left of their relationship. Scroll down for the entire story.