Multi sig privacy and security

Hi Community,

I have 2 questions that relate to a hypothetical scenario where I am holding bitcoin in a 2 of 3 multisig setup.

Question 1:

Let's say that I am holding 1000 bitcoin in one of the multisig receive addresses and 1 bitcoin in another of the multisig receive addresses. I tell a friend that I own 1 bitcoin as part of a multisig wallet and I show him that receive address on the blockchain to prove it.

Is he then able to reverse engineer all of the other addresses that would be held under that multisig and find out that I actually own 1001 bitcoin?

Question 2:

Let's say again that I am holding 1000 bitcoin in one of my multisig receive addresses and 1 bitcoin in each of the three singlesig wallets that make up the multisig as dummy amounts to watch to see if any of my seeds get compromised.

If someone was to find out (or even just hypothesise) that all three of the 1 bitcoin singlesig addresses are dummy amounts for each seed and relate to the same 2 of 3 multisig, are they then able to reverse engineer the receive addresses that the multisig holds and find out I have 1003 bitcoin?

Also, does knowing that the 3 addresses are all single sigs for each seed linked to the same multisig give them any advantage whatsoever if they are attempting to brute force my multisig?

Thank you!