Hi,
Welcome to the forums and thank you for reaching out to us.
A few things have stood out for me in your post that I would like to talk about, I am now in my 60s and have been through a lot of difficult challenges, which has changed the way I view things these days.
Please don't take me the wrong way when I say this but I think you are seeing this situation from a distorted perspective. It is never our job to impress anyone, the most important and valuable thing you can give to others is to be yourself.
You can choose to embrace his culture if wish, however, you are not obliged to do so. How can you possibly taint the bloodline when he is already White/Mexican? If he was pure Mexican, then the Aunt may have her own thoughts about that. From from where I stand, it is a racist comment against you to say that you would taint the bloodline. There is already too much racism in the world without adding to it.
If you and your partner decide at some point to marry and have children, the only person you need to be in harmony with is your partner. His family should not get to have a say in any of your decisions, it is not their life, it's yours.
I hope this helps and please feel free to continue the conversation if you are comfortable doing so.
Take care,
indigo
