OP, no need to be like that.
Money doesn't buy happiness (but it bloody well helps though).
If I were you, I'd be happy for your sisters.
My younger sister looked at what I did for a living, decided she liked it and would do the same course at uni, and then landed a job out of uni earning a decent 6 figure income that took me 8 years to reach. I'm stoked for her, honestly.
I never begrudge people that earn more than me, good on them I reckon. If its hundreds of thousands or millions a year, who cares, they got themselves into that position by their own doing (mostly). Being envious leads to tall poppy syndrome, which shits me immensely. I also think you can never earn too much. Just abiding by those simple beliefs has never caused me to be jealous of anyone, rather I usually start asking myself how I can get into that position.
Seriously man, just be happy for them otherwise its going to build up and you will end up bitter and twisted. I have family members (not immediate) that don't talk to me because I had the audacity to work my ass off at uni and subsequent work to set myself up financially, much to their displeasure. They don't exist to me, I have completely cut and shut them out of my life. I couldn't give two fucks if I don't see them again if they are idiotic enough to get bitter over their own percieved failures and my own progress.
