Sure, but they are not going to starve as written in the title. That's just a blunt lie. They live in Germany and there are plenty of support options.

There aren't support options because the way sanctions work is that anyone offering them any help becomes guilty of "violating the sanctions" and becomes sanctioned themselves. That is how the wife became sanctioned, by paying bills he could no longer pay due to sanctions. This means if anyone offers them any money, goods or services, including food, they automatically count as "attempting to circumvent sanctions" and will receive the same treatment. The sanctions are designed so that there are no support options other than having your children taken away by the government due to inability to feed them.

If the parents commit a crime related to their bank account, it's reasonable to block these accounts.

Neither of them have committed any crime whatsoever. They were not legally charged with anything and they have no right to a court trial. These are EU sanctions. That means they don't need to be legally justified and there is no court other than in Brussels where they can be appealed, but the sanctions include a travel ban which means he cannot travel to Brussels, or to any country where he is not sanctioned. This is effectively a slow death sentence. He was sanctioned for journalism which the EU alleges "destabilizes society" (by reporting on the Gaza genocide), and she was sanctioned for supporting their family financially.

The more relevant question is whether anything illegal has happened through his wive's bank account.

Nothing illegal happened through her bank account, nor through his. I repeat: this is not about a crime. They have committed no crime nor have they been charged with a crime.