I've tested kagi and agree that the search results are great. What I don't like is that it's making anonymous searching impossible, since I have to be logged in to use it (or use my unique token as part of the url for mobile searches).
Ultimately this means to me that in a private window mode (or even logged out with a fingerprinting resistant browser) I do not have the same degree of anonymity I enjoy even when using Google, let alone DDG or others.
I like the idea of not being dependent on google, but exposing my entire search history to one single entity is not my answer of choice.
If you're in acute danger, call the cops. A credible threat has been made. Even if they can't remove you or your brother, everything being on file might serve at the very least as a deterrent to execute his plan.