Will someone have access to your wallet without your device but the person manage to see your private keys and copy them without your knowledge. Will the person be able to withdraw your money or change password and block you from having access to your wallet?
Yes, that's very possible, this depends on how you handles your keys, your seedphrase is the ey access to your bitcoin on blockchain, once they take control over your seeds then your wallet is compromised and they have taken charge of it entirely, this calls for you to always safeguard your keys especially when it comes to seedphrase, they are the key access to your wallet and can be imported on any device to have access to your coins on the blockchain.