According to Business Insider, over the past few years there has been a steady increase in unmarried couples seeking out therapy dedicated to teaching them how to deal with their in-laws. Research suggests that women are more likely to experience tension with their in-laws than men.Relationship coach and consultant Peter Pearson advises couples to address these problems sooner than later, because they won't go away on their own. He says" a problem like that rarely disappears without some effort.