I've heard a lawyer mention that (in Germany) in these cases you should actually abstain from any remarks like "my kids didn't do this" because if you rule out all other possible suspects you only leave the default: yourself. As long as there are other possible suspects, the court is a lot more likely to dismiss the claims.

So, yes, if you shared the access with others (even your own family), that fact may be a get-out-of-jail-free-card. Just don't make the mistake of trying to protect them (there's no need to anyway -- as long as they don't make that mistake either).

Sadly there are still a lot of these frivolous lawsuits and the standard practice is to ask for a ridiculous fee and to sign a cease and desist (don't ever do this without talking to a lawyer -- otherwise you can suffer even worse consequences if additional claims pop up, even if they concern things you did before signing the document).