Relationship between addresses of same wallet

[patinencomun]

Hi,
I wish to know the relationship between accounts created with same seed:

Create a wallet, save the 24 word seed, (electrum, ledger,...) and gives me, for example, an ETH address: ETH1
Wallets can create new addresses, then I create ETH2. I have ETH1 and ETH2 adresses on wallet.

If someone knows that ETH1 is property of John Smith, there is possibility to find relationship between ETH2 with ETH1?

Same question in different way:
If a thief know that ETH1 is property of John Smith, John Smith must create ETH2 or must create a new wallet to be "anonymous" again.

Thank you.