Don't use Proton. The owner of the company is a Trump supporter. Also, Proton is based in Switzerland, I think a EU service is better for European citizens.
I don't want to ruin your day, but Proton is not a safe service anymore, after its owner publicly expressed his love for Trump. So, I highly suggest you to try and move to another European service such as Posteo or Tuta.
The sad thing is that those children were innocent. It's their parents that are stupid.