If he's comfortable with the topic, I think it would be fairly safe for you to come out to him. There is no way he can find out you have a crush...
You could tell her the truth or just brush the question off, whatever makes you feel comfortable. She's your mother, so it's only natural for her...
Re: Transgender Individuals Recognized For First Time Ever In A State Of The Union Sp Things are looking up, now more than ever.