I can understand what you are going through. My grandfather is HIspanic (straight off the boat), but my grandmother is white. This has always been a huge family secret that I did not even know about until my teenage years...I do not want to get into right now, but I wanted to let you know that I do understand how it feels. It sucks to have to check those boxes and I try not to anymore...I usually just check "other".
It is hard being in a world that is so clear cut when you are not...

Jessica