You need 3 people to create a 2/3 multisignature wallet for example. That means that 2 people would have to sign the transaction before the funds could be spent. Are you the only person that has access to these wallets? In that case it makes no sense to create a multisignature wallet.
It does if he wants a “2FA” to spend his coins. Both devices/wallets would need to be compromised so the hacker can spend his coins. IIRC, you CAN create a 2-of-2 multisig wallet, I just can’t explain the steps right now cuz I’m on the phone. :/