Research shows that three issues top the list as sources of conflict in romantic relationships.
Relationships with in-laws is not one of these three sources. However, it is a source of conflict because if one of the partners has disagreements with her/his in-laws, the spouse may feel caught in the middle between parents and the partner.
The answer would be the developmental stake. This is a speculation that expresses that youthful grown-up youngsters and their folks fluctuate in their impression of generational relations in light of their area inside the family genealogy and their formative stage.