Only one petition at a time. IF your parents file a petition, your brother withdraws his. You fail to state your citizenship. Or your marital status. IF you are or ever have been married, your parents must become US citizens before they can file any petition for you. You also fail to state your Priority Date - the date your brother's petition was approved for processing, and that would be at least several months after filing, possibly a couple of years after filing.
For siblings, over the past year it has been taking 13-15 years for sibling petitions on behalf of citizens of most countries. It can be as long as 23 yrs, depending on your citizenship. For parents with green cards petitioning for adult child, it currently takes 6-22 years for Priority Date to become current, depending on your citizenship.
Who is going to be in position to meet earnings requirements for the Affidavit of Support you for at least 10 years beyond your date of arrival on immigration visa? Are your parents going to continue working & earning enough for up to @ 35 years? If they are not working, earning enough when Priority Date becomes current, there goes your petition.