If there was no will, the property is supposed to pass to the heirs under the intestacy laws, see
but the heirs can agree on a different distribution.
An oral will is not legally valid.
Someone is supposed to file a petition to be appointed as Administrator of the Estate, get Letters of Administration issued by the Court, then take charge of the Estate property, publish a notice to creditors, file a final tax return, and account for their management. This can be done without a lawyer using
The administrator gets a small percentage for doing this.
Everything your brother has done is illegal, and you or another sibling should probably file a probate petition, get appointed, then force the brother to account for every cent that he handled.
You can get a free consultation from some of the probate attorneys listed by location here.
I hope this information is helpful.