Is this a moral conflict, i.e. you don't feel comfortable spending that much money? Or you're actually giving so much money to your parents that you can't afford to buy a house?
For example, my down payment could buy my Mom's house, my Dad's house, and my brother's house. The conflict is -- how can I spend that much money on myself? Instead, I could retire both of my parents, and set my brother up for success at the cost of continuing my current life as usual.
It doesn't seem like a huge burden to me to continue my life as usual. And it would be completely life changing to the rest of my family (the people I care most about) to allocate my money in a different way.
On an infinitely smaller scale -- this is similar to the Bill and Melinda Gates Foundation. How much money should you invest now to help people in the future vs giving people money now?
When I was 20, I was giving my family 10s of thousands of dollars a year. The cost of that was that I delayed my career advancement to the point I could be making an extra $100-200k per year now. Sure, I'll get to that point in 2 years time.
But was it really worth it to spend $30k to pay for some weddings and refrigerators and medical expenses 8 years ago to miss out on $300K+ in earning potential over that time period? No. Definitively.
Is it worth it to give my family $200k now when I hope to turn that into a million+ in 5 years? I don't think so. How do they see it? Well, they want the $200k now. Maybe that type of vision is why we're in different situations. Who knows?
If I were in your situation, I'd want to secure my own family's housing and retirement at least as much as your parents' housing and retirement, so as in many things, balance is going to be key. But if you truly value changing their lives at the expense/delay of your own, there's nothing stopping you from doing it and obviously nothing wrong with it. It's a very personal choice.
And if you are making huge amounts of money it's completely reasonable and rational to spend it to actually increase happiness and opportunities, given that one cares about people around them.
Where exactly are you investing $30,000 that returns more than 100% / year for 8 years?
The opportunity cost of doing things when you're at a low wealth level is enormous.
The obvious example would be to consider the gap between being homeless with $0 and being homeless with $5K.
Your earnings potential just essentially went up by an infinite amount because now you can rent an apartment, get a job, perhaps buy some study equipment like a computer or whatever, and suddenly that $5K can be well north of $50K.
This isn't stock index tracker stuff, this is home economics.
I finally break 6 figures and my kids are almost graduated into college. If I left them behind after the divorce I could literally blank check pay for their college.
But I'm deciding to be their dad instead of chasing the money. But 3 more yesterday the last one graduates and I'm ready to go do machine learning and all the fun stuff. So. Sick. Of. Web sites.
I would recommend you let your family be. There earlier stuff in your career was health problems you said and people come first. The houses you talk about now are like gifts. They don't have immediate need so you can get them something better in the future.
And just how hard is it to reach your level btw? I've been programming twenty years... Is it hard to get a job after 40?