anki-delay-siblings VS PushParadox

Instead of messing around with ease factors, I'd suggest the Suspend siblings until mature add-on for new cards, and Delay siblings to spread out the current ones. That should pretty directly get what you actually want, with your siblings introduced at different points.

Once they're all in a single note, then I do more-or-less the opposite of your approach, by pushing the siblings as far apart as possible. I use Delay siblings for mature cards, and Push Paradox for new cards, although I'm strongly considering moving to the newer and maintained Suspend siblings until mature add-on.

Because they're all siblings, I can use Delay Siblings and Suspend siblings until mature to spread them out, so they don't hit all at once.

You can't make cards from separate notes treated as siblings. What you can do, though, is generate several cards from the same note. For instance, I modified my Basic note type to have 10 pairs of Front and Back (Front 2, Back 2, Front 3, Back 3, etc), and an Extra field to put on the backs of all the cards. That way, I can put a bunch of questions together in a single note and generate separate cards for them. Sibling burying, the Delay Siblings add-on, and the Push Paradox add-on help me spread them out further.

Rescheduling siblings like this addon does should be a built-in feature. Without this you can get a yard with a multiple-year interval, and then get the reverse card the next day. This doesn't accurately capture if you've learned this card because your memory was just refreshed the day before.

Why doesn't anki make something like this add-on a standard feature? https://ankiweb.net/shared/info/1369579727

Some cards contain information that can be found in others without necessarily being siblings. I want two separate cards to become siblings so that I can automatically delay one of them, by using an addon like this one. This would fix the problem of reviewing card A and then later in the same study session guessing another card B correctly just because card A contained related information.

Sorry if I'm being annoying, but there's one more thing - take a look at this add-on and see if it's compatible with FSRS.

Once they're all in a single note, then I do more-or-less the opposite of your approach, by pushing the siblings as far apart as possible. I use Delay siblings for mature cards, and Push Paradox for new cards, although I'm strongly considering moving to the newer and maintained Suspend siblings until mature add-on.

You can't make cards from separate notes treated as siblings. What you can do, though, is generate several cards from the same note. For instance, I modified my Basic note type to have 10 pairs of Front and Back (Front 2, Back 2, Front 3, Back 3, etc), and an Extra field to put on the backs of all the cards. That way, I can put a bunch of questions together in a single note and generate separate cards for them. Sibling burying, the Delay Siblings add-on, and the Push Paradox add-on help me spread them out further.

https://github.com/lovac42/PushParadox does just that. It hasn't been updated in forever, and only works for the v2 scheduler, but it still works and I dread the day it stops working.

Push Paradox (unmaintained, and only works with the v2 scheduler, but so useful I can't give it up. Delays new sibling cards until the old siblings are mature)

My "Basic" note type has 10 question/answer pairs, so I can easily add details and organize things. It also has an "Extra" field to summarize whatever topic. I use sibling burying, PushParadox and Delay Siblings to help spread things out.

I use the addon PushParadox (Sibling Cardistry), that is only available for the V2 scheduler and it's only available on github. If you're using an Anki version prior to 2.1.45 it should work fine.

I've been using the PushParadox add-on, and it's still working well for me (v2 scheduler only). There's also the Trigger and actions add-on, which is still supported, but a little more complicated to set up. The latter could be used to retire your card 1, but I'd suggest against it; just let it stay, but let the interval increase. Ideally, you'll want to know words both ways eventually anyway.

My own approach is to make a custom note type that generates up to 10 sibling cards, with related questions and answers (but all the the same Extra field with a bunch of extra details on the back), and then use Delay siblings and PushParadox to spread them out, though of course that only works on desktop.

For some reason, the Push Paradox add-on isn't in the main add-ons list anymore, but it still works, and it does almost exactly what you want.

It's still working for me (using the v2 scheduler, 2.1.44), it's just not listed in the add-ons repository. But the GitHub repository still exists.