This is a test, don't apologize. Deep down she probably knows her sister is nuts, but will stick by her. Let her, and don't seek to build a wedge between them. It's best that she comes to terms with this on her own.
I probably have spent an hour a month responding to family members unvetted information forwarded that piles up in my inbox.
"Let's create a username that they'll hesitate to deport"
Deported
That's a ton of step-dads for you to answer to.
It would be a damn shame if one of the ballots got out for massive duplication and submission.