In the US (the most sue happy place on earth) the guy probably wouldn't get a payout.
At least from reading the article, it infers the surgery and everything done went off without any issues. In the US, if you want to sue and win, you have to show that damages were done to you.
So while it was wildly inappropriate to have a 13 year old there or touching a patient at all, the patient would need to show that it caused damages.
It likely was harmless, since the article infers ther surgery went well. It was just inappropriate and looks bad. When suing in the US you have to show damages. The patient may have a hard time winning his case.