I just say “it’s personal, and I won’t be discussing it.” If they don’t want to hire me because of it, I don’t want to work there anyway.
It’s absolutely none of their business what I was doing, especially that I went into a deep depression after my mom died and my live-in ex cheated on me while I was caring for her, and then spent a couple years selling her non-sentimental possessions to live off. And I’m not willing to make up some bullshit to hide it either, it happened and I’m not ashamed of it, but I’m not sharing it with interviewers. Meh meh.