<human>: Can you condense the text into three sentences or less?

Some background info: We just moved into a $400,000 house that my parents (mom and step-dad) bought using quite a bit of my step-dad's retirement fund. They have been married for about 3 years and were together for 8 years before that. My mom and older brother [21/M] get into arguments constantly. Neither of them can act like adults and have a normal conversation without yelling at each other. My step-dad is obsessed with going to the gym and working out and takes A LOT of supplements and has all kinds of powders; the relevancy will become apparent later on.

So, onto the issue at hand. After my step-dad went to bed my mom went into the office. I paid no attention to it at first. Later, I had to print some papers for school and when I went to get them off the printer I saw a note sitting in front of my step-dads computer. The note reads "Every time Mark calls you jump? What are you his fucking BITCH? I am sick of all this shit.... Woodys [a bar both he and my mom often go to] especially!!! Give it up or prepare to live your own life and I will make my own plans and live mine. This is not a "marriage". You choose the bar + I am home alone...."

This kind of thing actually happens quite often. They yell and tell each other to leave. Neither of them do. One of them sleeps on the couch for a few days. Everything is back to normal until the next fight. As of now I have taken the note and have it in my room because placing it there was incredibly childish of my mom. Was this the right move?

I also looked inside of my step-dad's desk and found some insulin syringes, as far as I know he doesn't have diabetes and I'm pretty sure these syringes came in the mail. The other thing I found was bacterostatic water. I'm not really sure what it is but I think it's just sterile water.
<bot>: My mom and step-dad fight a lot. I found a note my mom left for him. What should I do with it? Also, I think my step-dad may be using illegal drugs.