What is an unambiguous way to describe the resulting relationships when a widower with a child marries his deceased wife's sister and has children with her?
Not the stepmother-aunt stuff for the first child, but how can the relationship between the first child and their sibling-cousins (and subsequent generations) be described?
Family A: Father 1 & Sister 1 (dies);leaving Father 1 remaining w/Child 1
- Child 1
Family B: Father 2 (dies) & Sister 2*;leaving Sister 2 remaining w/Child 2*
- Child 2
Family C: Father 1 & Sister 2; inheriting Child 1 & Child 2 and having Child 3 together.
- Child 1 (From Family A)
- Child 2 (From Family B)
- Child 3 (From Family C)
Child 1 & Child 2 were originally 1st cousins, but now what they are is not as clear to describe their dual relationship.
What are unambiguous ways of referring to child 1's relation to 2 & 3, and 2's to 1 & 3, and 3's to 1&2 in the new family C group?