I would like this too.
This has been asked for before:
- Manually link cards from different notes as siblings.
- Marking Related Cards for Smarter Scheduling.
- Reddit: How to specify that notes/cards made separately are siblings?.
- Reddit: Manually Mark Siblings.
- Reddit: Link already made cards as siblings?.
- Reddit: Add-on concept: Tag notes as siblings.
A better way than using a plain field is to basically duplicate the tag system and call it “families” or something like that. Notes with the same family generate siblings.
But there should be a better way, one that avoids the user having to manage “family names”.