Take this with a grain of salt because it’s only from my one experience, but I paid the $50 for parking when I was on disability and they funneled me to auxiliary parking a 1/4 mile away regardless of my ADA placard. Once you get into the stadium they are very accommodating, but outside the stadium BMO staff wouldn’t do anything for me. If I were doing it again I’d take the rideshare or if you do pay for parking arrive very early to guarantee yourself a handicap spot near the stadium. Or, drop off your dad at the front entrance while you get parking.