Relationship to me isn't always what that represents. It is the relationship to the home person. The home person is not always the tree owner. Also, the tree owner is not always in any way related by blood. Many people have trees for research purposes only for entirely unrelated people. Further, if this were to be applied to the DNA folks, the tree owner is not always the person who took the tests. Frequently, the tree owner is the person who helped administer the test. Some trees are surname studies that are the opposite of what most people expect and the home person is the first known person with that surname. And there are in-law relationships, adoptions, partnerships, etc. that have always been difficult for this. This could easily lead to false assumptions. If it is to be given more significance than it would need some work.