I really think I can change their minds. My step-dad will almost definitely be impressed by the research. Also, if they say I'm not responsible enough I can fall back on being in student council, willingly doing science fairs four times this year, taking care of a baby, having a job, taking care of the family fish (im the only one who feeds them) getting straight A's, being in student council, and joining choir. Also, I can answer any question they can throw at me and pay for it. And my mom will be easy with him on my side. Fingers crossed!
P.S I usually get a 'present' each year I do science fair and do good in school.