Google knows everything, lol :) I'm actually afraid how much it knows, your searches, for once, tell it stuff you don't share with your wife. All your account's emails, drive files. Is your company uses Google? Is your kid's school uses Google? Have Android with location services on? Btw, in Android, you don't have option to restrict location data to an app while using the app, as you can in iOS.
I'm about to create extensive guide on un-Googling yourself and your family. Mainly use Apple ecosystem, they make money selling you phones and macbooks, not your data.
First thing is don't give Google any info to identify who is behind that browser, if you go to google.com directly. Use VPN to shuffle IPs, use only Private browsing windows (kills cookies), don't stay logged in to Google, don't use Chrome.
Second, is to block tracking network requests from most of the websites to Google, like (googletagmanager.com, googletagservices.com, google-analytics.com, cloudflare.com) by using adblocker (uBlock Origin).
theoretically they can, because they're running javascript on the page. but in practice I doubt it, just like I doubt that scripts from googleapis.com aren't backdooring your websites.
So now google know everyone opting out I assume?