What's the question? I am Mexican American and I don't understand what you're trying to ask.
how would your parents not know youre adopted?
Answer:
Yo me lavo las manos antes de desayunar.
Explanation:
3. Yo me lavo las manos antes de desayunar.
...
So for the usted form, you use the 3rd person singular of the present subjunctive instead of the 2nd person singular present indivatice so, 'hable'