So let's say I make a 2 of 3 multi-sig.
So I have a total of 3 seeds and 3 zpubs.

Am I correct to say that I require at least 2 seeds and 1 zpub to be able to access the coins?

So if I lose one seed and its associated zpub, then I will lose the coins?

So if three people have joint custody, the seed storage should be as follows?

Store seed    Store zpub
    1               2, 3
    2               1, 3
    3               1, 2