Answer:
Dear Dad,
I am writing this letter to apologize for bringing a guy over to our house without your permission. I realize now that it was disrespectful and inappropriate, and I regret my actions.
I understand that our home is a place where we should feel safe and comfortable, and I should have respected that by seeking your permission first. I was thoughtless and selfish in my decision, and I want to make it right.
I want to assure you that it will not happen again, and I will make sure to communicate with you in the future before making any decisions that could affect our home or our family.
Once again, I am deeply sorry for my actions, and I hope that you can forgive me.
Sincerely,
[Your Name]