[gradExMachina]

The online consensus seems to be that Windows Defender (M$'s) is likely the best AV for windows. Perhaps you could tell them to get malwarebytes if they feel the need for one.

[account42]

IME, Windows Defender does not care about false positives any more than the other vendors.

[radlad]

I think the parent was just trying to save OP's parents some money.

> My parents still buys antiviruses for Windows

[gradExMachina]

That was my intention.