When I first asked for help, my family was in denial. 3 years later, when I sought help myself and received a diagnosis, they didn't believe me. Like your family, they tried to discourage me from taking meds. They are more understanding now, more because I showed them my symptoms as they were happening. I don't have the courage to talk about the past, haha. But I was able to stop hiding my depression by faking a smile, and then they got it.
Now my mom still tries to get me off my meds, but that is just because she thinks they're causing my physical symptoms. So, she is still in denial, this time over me having a medical condition rather than side effects.