You can’t simply just remove the person you will have to create a new multi sig account and then move your funds there.

This is 3-of-5 multisig so if the person is just one co-signer you still have four more co-signers left and the need co-signers to actually move transactions is three so such person who is a problem is simply not too much of a question because even if they try to actually move coins from such wallet the person will need the two more extra co-signers from the remain four to be able to do anything.

But for security you will need to create another multi sig again because you cannot remove a co-signer and add a new one AFAIK. You can easily your coins to the new wallet with the help of the remaining Co-signer

You can’t simply just remove the person you will have to create a new multi sig account and then move your funds there.