Should parents finance grad school?

Should parents help their children pay for grad school if they can afford it? My parents are divorced, but both are in households considered in the top 1% of the US in terms of income and net worth. After limited financial assistance from them during undergrad, I am getting no help at all for grad school. Am I out of line to expect that I should? I am transitioning from undergrad to grad school (after taking a couple months off), and am now faced with footing $60K in tuition and living expenses over the course of the program. While I realize there are a number of funding options ? like private loans, which I will be taking ? I have developed an unhealthy resentment towards my parents due to a combination of their significant financial status/holdings and concurrent unwillingness to help me offset the cost of my education. I have given an elaboration on the relationships with my parents below. Do I have irrational expectations? If you could please offer your take on the situation or even general insight on how I can get the hell over the resentment, I would be most appreciative. My mom is technically remarried, though not by ceremony. She and my ?stepfather? (with whom I have an awkwardly disconnected, though very polite relationship) have lived as ?man and wife? for 15+ years. They try to maintain something close to a balanced partnership, e.g. they own their house 50/50. Over the years, his success has become disproportionately greater: while my mom makes a bit over $100K/yr, my stepfather pulls $400K+ and recently sold his share of his company for somewhere between $7-10M in cash. Concerning school, my mom helped with exactly half of my undergrad expenses (disqualified from Federal financial aid and reluctant to take loans, I worked to make up most the difference). However, she is adamant that I should not expect any monetary help from her (or my stepfather) going into grad school. My father runs a sizeable company (it has $50M in assets, limited debt, and he has a majority holding). On a weekly basis I watch him squander hundreds to thousands of dollars on, what seems to me, useless shit (nondurable goods and services). This has gone on for years. I have asked him repeatedly for even meager financial assistance, which he often promises, but has constantly failed/fails to deliver, despite his otherwise seemingly frivolous spending. Additionally, I guess it doesn?t help that neither of my parents agree with my chosen career path. While I don?t think my particular field is important for this post, I?m going to a moderate-to-highly ranked school and the program will lead to a $55-75K/yr job when I am done (based on for average starting salaries for past grads). I also have one younger sibling who is in college. I?ve also set up a throwaway e-mail: mefi.is.a.sugardaddy.of.wisdom@gmail.com . Thank you very much for your time and consideration.