Hope, to add to other posts: probate is very expensive. If your parents did a revocable living trust with your name(s) on the trust, the property goes to you without any additional title changes or probate costs. Attorneys fees for court probate hearings can mount mightily.
As far as who receives property if a person dies intestate (without a will): each state's laws are different. The order of sucession is usually parents, then children, or if the children are minors, then to the guardian (hoping there is one) and then on to other various family matters.
Here in California, a person can get a list of attorneys from the State Bar and consult with an attorney for $35. The work an attorney might do to set up the trust, however, could be $1000-3000 or more--it depends upon the attorney and the amount of work to be done. You should definitely consult with one as soon as possible. You should also get a power of attorney from your parents so you can pay their bills while they are ill. Do they have a document on file about medical treatment? This is all so hard to do, but you will be very, very glad you did.