Thank you for clarifying. What I have to say here is for the sake of perspective.
Yes, absolutely it is your right to spend your money as you wish, and you don’t owe anyone anything.
But, you also have to live with this person, and presumably you would like to continue to have a relationship with them. Your mission now is to figure out how to keep some good will for this person, who I imagine you otherwise like. So, while knowing that it is your money and you are absolutely in the right…try to understand it from their perspective. What are they seeing?
I know that when I enrolled in college, I was given the impression that my college loans would be taken care of after I graduated, and I was encouraged to borrow to the maximum because “that’s the lowest rate loan you will ever get.” I didn’t expect this, but I knew my family had put money away for my education for some time and I was thankful for it. And I made certain decisions based on this idea, such as focusing on my studies and choosing not to take a McJob for pocket change at the risk that it might hurt my grades- and I graduated with honors. I’m not sure what happened- if I misunderstood or if there was a change in priorities or what, but when I graduated my loans were there and I was the one paying for them. Now and then, there is still a reference to me “not having to worry about my undergrad loans.” But what will really happen? I don’t know, and I’ve learned not to count on anything other than myself.
My family is great, and I know they’ve always tried to do the best for me and would never leave me on the street. But that situation was pretty difficult for me to resolve mentally, and I did hold some resentment for quite while- not so much because I felt like I was owed a free education, but because I felt like the rug had been pulled out from under me, and if I had full information from the beginning I would have planned things a bit differently. Enough time and distance has passed that I’ve essentially forgotten it, but there were a rough couple of years.
I’m sure my family has some completely different interpretation of what happened that makes perfect sense to them, and probably involves me at some point looking ungrateful and entitled.
I get the impression that the person you are talking about isn’t just a rotten-hearted person. Chances are they somehow, at some point, picked up a set of expectations. It probably came from a lot of things- family culture, maybe some misinterpretation, just plain wishful thinking, some human selfishness etc. And these expectations became real to them. And now they are disappointed. Yes, they have no right to be disappointed. But they are, and even when you have no right it has an emotional impact. It can be tough to make sense of, and when you face what feels to you to be some kind of emotional betrayal or disappointment by someone you are close to, it’s easy to react poorly and to lose sight of the reality of the situation. It sounds to me like they are probably reacting emotionally, not making some calculated move to claim your cash.
For everyone’s sake, probably the best thing you can do now is be patient and diplomatic. Eventually they will get accustomed to the new expectations and will probably become more supportive. And with any luck, hopefully soon you will have some disposable income to help out everyone in your family should you choose to.