In general, you merge duplicate people because they are one and the same person. What do you hope to accomplish by merging two different people who are first cousins?
P.S. If you are trying to overcome some querkiness in how the Family Tree View in Ancestry looks, you are spitting into the wind. Ancestry can only do so much in a single view to show an unusual relationship.
P.S. If you are trying to overcome some querkiness in how the Family Tree View in Ancestry looks, you are spitting into the wind. Ancestry can only do so much in a single view to show an unusual relationship.