When a parent with their own children enters into a new relationship with someone in a similar situation, there's often a lot to consider. Suppose the couple decides to merge the two families within one home. Blending these two families can take time for everyone to adjust. There is a lot of potential for rivalries to develop, and some family members could feel neglected. Since bonds take time to develop, parents of blended families can face challenges around developing ground rules and agreeing on how to establish authority and handle discipline, especially for teens.