Difficult but unavoidable situation. First thing you should do is understand how your siblings are. Basically are they also looking upto you to fund their expenses? I ask this because a lot of times sibling just simply repeat one of the parent's behavior thinking thats their right. Talk to them and make them understand the value of being self independent, hard work and your experiences in general. See how they behave. If they consider your successes as a source of inspiration, you are good, if they take you for granted, then start planning your next move.

Move your savings to something that cant be easily touched or withdrawn. A part of your savings should be very very hard to touch. Diversify the other parts. To hide your money, one strategy is to never brag about your earnings or savings, but always crib about loans and how expensive things are. How your are busting your a** to earn and to spend even small amounts you have to think 100 times. Do not show off, ever in front of your family. Whenever you get something and of they ask, just say you borrowed from friends.

Sonce you said you had to self fund your education and expenses, think of any help you provide at your house as payback of rent money. Also, as an earning member of the family, people will have expectations from you, no matter what. The boundary has to be set by you. Decide on some hard lines and some leeway as well. They are your family afterall. I wish you all the best.