<human>: Can you summarize the given text in a few sentences?

Hey guys. I have maybe an hour to an hour and a half until my step mom comes home, and then I doubt she'll really want to talk to me after that, so maybe 2 hours. Advice before (and even after) is appreciated. 

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So my dad basically yelled at me the whole ride home because apparently my step mom, A, has been upset because I don't say thank you for things like them buying me soap or tampons and stuff. No one else I know does this so I wasn't really aware I had to, bu I lived with my mom for a long time and she was rather neglectful.

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How should I phrase it? How should I approach her? I don't talk to my dad that much due to past issues, and I'm not really close to my step mom either. To be honest I'm kind of scared. I don't think my dad will hit me or I'll get yelled at or anything, I just really don't have a good relationship with either of them. 

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Thanks again should anyone read this and be able to help me out.
<bot>: got yelled at for not being grateful enough, how do I approach and phrase an apology/thanks to my step mom?