Whew, I'm not sure this is just a young person's problem. When I was growing up, we had a family that copied our family, even to the extent of selling their house and moving to the same street where we had just built a new house. Unreal. I think the source of the copying was the mother, and I remember it being the topic of numerous heated discussions. I wish I had a solution. It is a very vexing problem. In our case, finding ways to distance ourselves seemed to be the only thing that really worked.
Editing to add one more note about the copying family: Their children have grown up to create families that are obviously dysfunctional, so this copying behavior is definitely not flattery, but a symptom of a very real problem.