I have a person who was adopted by a family. I’ve added that person to the relevant family. I also know the names of this person’s birth parents so I’ve created another family from those data and added the person to it.
When I then generated an interactive family tree, I expected to be able to click on this person and see them connected to both their adopted and birth parents but only their adopted parents are shown.
It must be a limitation of the interactive family tree. If I view this person in Gramps Graph View then they are connected to the adopting parents by dashed lines and to their birth parents by solid lines.
This is the topmost family in the Relationships view. (Parent and Spouse)
The order of Familes (both the Parent and Spouse families) can be changed in the Relationships view for the Active Person. The order of Spouse Familes can be ordered in the Edit Person dialog for that person. Re-ordering is an important and complex aspect of Gramps relationships.
Some analysis recognizes multiple relationship paths… but that is more on an exception than a rule.
I assume you mean the Narrated Web? It does include any additional set of parents. One setting that may interfere with this if one of the parents is set Private and the NW excludes objects locked with the private setting.
You will notice that any set of parents that are not by birth are always listed as stepparents even as the relationship type is listed as adopted. I have filed a bug #10554 to have this addressed.
The sets of parents are created in the order of the parents set in the Relationships view.
I forget that report/view is available. I have a large family tree with many interconnected families. The interactive Family Tree is impractical for my use.
Testing it on a small subset database shows that only one set of parents is available, and the default set of parents shown is the set of parents listed first. The other parents are in the view but the user must know this and must use the search to select them.
Another addon view is the Graph View. It does show multiple sets of parents for the active person. It is highly customizable in particular for the number of generations to display both up and down. It also has the benefit that the people and families can be edited from within the view.
The All Connected option includes in-law individuals. Note: Depending how wide your tree is the number of people that can be displayed is 1000.