Ok, before I say anything, I know I shouldn't be planning this right now. However, I want to put my mind at ease earlier, so please don't reply with "it's too early to think about this" unless you really think that I should get through first year first.
My problem is this. If I assume everything goes my way, and I get into Chancellors (which is a big ask) and get an extra two subject slots, I have 22 non-breadth subjects. Assuming that I passed the Chemistry 1 and Chemistry 2 exams that I did today and am granted an exemption from that prerequisite, I would be able to major in both physics and chemistry, using 20 subjects (AM 1/2, bio 1+2, Vector Calc, Complex Analysis for fun, three physics second years, three chemistry second years, four physics third years and four chemistry third years, and yes I do want to do complex analysis because it looks like fun and parts of it make sense to me). However, my parents have nevertheless instilled doubt in whether I should pursue a science career in physics and chemistry without biology; they want me to do Medicine, which would require that I spend three second year subjects doing that. Unfortunately, that means I would be on 23 subjects, and the only viable way I could get around that is to cut complex analysis, which would be a massive shame. Or, I give up one of my majors, which I'm highly reluctant to do.
So, is it worth doing these extra bio subjects? Without those subjects, I would have another two spare subject slots to do another physics or maths subject (assuming Chancellors; I want to see if I can fit everything in if EVERYTHING GOES MY WAY FIRST; please let me make an optimistic prediction first

), which would be great for me. However, there is that nagging feeling that I'd be letting the family down by not doing medicine (parents own a medical centre), and that I may possibly fail to find a decent career later on. Any thoughts?
Things about me that may help: I didn't quite like year ten biology because of the rote learning; however, the biochemistry I saw at the ASI Chemistry Summer School earlier this year seemed interesting. Explanations of biological systems using chemistry also seems interesting to me. However, I'm more of a physics and chemistry minded person I think. I'm semi-decent at those.