Ask HN: How do you preserve individual browsing privacy in a household?

You could start by installing an ad blocker such as uBlock Origin in everyone's browser to avoid ads and tracking entirely. It's even supported in the Android version of Firefox.

You could use a search engine like DuckDuckGo that doesn't remember your search history.

You could look into using a network-wide ad blocker such as Pi-hole: https://pi-hole.net (requires some flavor of Linux).

Trying to raise awareness of legislators that tracking by advertisers gets more rigid rules and support manufacturers and devices that do not feature ads or at least targeted ads.

Since it is probably the IP that is tracked, maybe implement a VPN service for the whole family or have your router to scheduled dial-ins to reset your dynamic IP (if you get one).

For web browsing I would recommend an ad blocker, It think it is pretty much mandatory to enjoy the web. Also hits sites with responsible advertising, you would have to whitelist them manually as they are often dependent on it.

Using a privacy-focused VPN like Mullvad is probably the best way to get your different devices distributed over multiple public IPs.

The other general privacy suggestions mentioned like uBlock Origin, Pi-hole / similar, DuckDuckGo, etc are all good as well.

Thanks everyone for the suggestions and responses.