As far as I know, the notes are assigned a number that denotes its
appearance order.
You can see it on Anki Desktop's Card Browser.
The siblings will have the same number, and then they will be
introduced very close to each other, but not on the same day.
I also had some problem with that, and the workaround I found was to
reposition the new cards.
On Anki desktop, it is in Card Browser > Select the cards > Edit >
Reposition (you need to select which cards you want to reposition
before).
I usually pressed C-a C-S-s to select all and open the reposition menu.
After that, I could see that a different number was assigned and I
could also noticed that I was not seeing the other siblings when I was
studying.
On ankidroid it is also possible to do it.
Open a deck, select Deck Options (top right corner) > New cards > Order
Here I need to change it to "Date added", and then back to random order.
However, it takes some time to reorder the cards.
I have around 20k cards (but only 3k new cards), and I guess it take
one minute for each reordering.
This is probably a problem with ankidroid (or maybe my old phone), as
it is done instantly on the desktop version.
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