Once two brothers got married with two sisters,the lines cannot be made correctly. Like the picture below, A and B are brothers. C and D are sisters. Two sisters can't get the line as sisters.
A suggestion wold be to draw the person with some reference like "This person exists somewhere in the tree", and some sign (*) for find the same person, (**)
In my case, I have my tree broken my farher's brothers are part the brother of my father that is married with my mother's sister. And my mother's sister appears in my tree with her other brothers.
Having this fixed, my tree should be fixed, or I'll have to make everything again ?
