Bitcoin Cryptocurrency Mastering Development

Clarifications on hd multisig wallet

I need clarification on multisig hd wallets. Let’s imagine we have a 2/3 multisig. The first key is generated by the user on a mobile wallet, the second is kept on a server while the third is off-line (for emergencies). In an hd wallet the seed is generated from the seed phrase and, from this, the Master Private Key.

How does the generation of the other 2 Master Keys happen?

What do these keys share?

When new private keys are generated by the user are new keys derived also on the server?

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