My (29M) GF (29F) is upset because my parents have their assets in a trust.

I have been dating a girl for close to a year now and it's getting pretty serious. We're both in our late 20's and are at a point in our lives where we both would be looking to move on to an engagement pretty soon. She's smart and i think our personalities really compliment each other.

A few days ago, we were at my house and my sibling was there, i think the topic of conversation came up while they were poking fun at me about being a spoilt manchild or something and my sibling mentioned the trust. At the time i hardly noticed.

Later she started quizzing me about it, and i didn't want to lie or be dishonest with someone i want to spend the rest of my life with. So i explained that my parents, and their parents had worked very hard their whole lives to build up assets so they next generation would have a much better chance at life. Unfortunately we don't live a meritocracy and even a little wealth can help shield you from the bumps and knocks of life. My parents had always instilled in me, that i was only one link in a chain and its my responsibility to work to provide even more for my owns kids and those of my sibling than they had for us. While i technically will own 50% of the trusts assets its not really for spending.

The issue is that while i have a good job and a fair amount of savings myself, the assets in the trust are significantly larger and she is saying that it's like i and my parents don't trust her and this is tantamount to me asking her to sign a prenup. She has a good job herself and was saying she is bringing everything she has into a potential marriage. I tried to explain so am i, the rules were set by my parents and if i'm honest since i was raised in that environment i do believe i have a responsibility to provide even more for my kids to help insulate them from difficulties that i had to face in my own life. Any children i have would be recipients of the same trust and we have enough money with our own combined salaries to live a middle class lifestyle without it anyway. So i don't really feel comfortable asking my parents to put things specifically under my name. But she was adamant it showed my family did not fully accept her and i should not allow them to treat her like this. I'm not a big fan of confrontation so i admit i did walk away after the conversation was going in circles and now she even more pissed at me.

I tried to explain that its not really my position to tell my parents what they should do with their own savings but we just keep going round in circles. Am i missing something here? is this really disrespectful of my parents to do?