[ComodoHacker]

Secrets are either written down somewhere and end up on the Internet, or forgotten.

[theGeatZhopa]

It doesn't have to be the unspeakable, but rather can be the name of the first pet or something others just can't guess on the first time.

[pixl97]

The problem here is you're assuming your family members aren't idiots, this is your first mistake.

Chances are they've already shoved some app on their phone that's voice to txting everything they say and sending off somewhere (well lower chance if they have an iphone).

Modern life is data/information security and humans are insanely bad at it.