Parents
Parents of a note are defined based on the lowercase Note Name.
1. Top-level notes (e.g., a1) will NOT have a parent.
In this example we have the following notes:
- a1 (vault1)
- a1.a2 (vault1)
- a1.a2.a3 (vault1)
- a1 (vault2)
- a1.a2 (vault2)
- a1.a2.a3 (vault2)
Notes a1 (vault1) and a1 (vault2) do not have parents, while all other notes in this example do.

2. A note can have multiple parents (in multi-vault scenarios).
In this example we have the following notes:
- a1 (vault1)
- a1.a2 (vault1)
- a1.a2.a3 (vault1)
- a1 (vault2)
- a1.a2 (vault2)
- a1.a2.a3 (vault2)
Note a1.a2 (vault1) has 2 parents: a1 (vault1) and a1 (vault2)
