By testing the safety of the form in an inherited form, the property in the form ViewSecurityKey "son" does not work, only the form of "father

Any suggestions?

Not sure what you mean by doesn't work. Are you using role based security? Check out the "Form-Level Security Keys" help topic to see how it should work. There's a table at the bottom outlining what should be happening.

I really don't understand either.  Greg had some good questions, please answer.  Thanks.