How to accelerate green card application for sibling?

You can check out the waiting time for yourself. A US citizen filing for a sister or brother files under the F4 family preference category, which is the lowest of all the preference categories, and takes the longest period of time. Numbers of available visas in the preference categories are limited. Check out the Visa Bulletin which comes out each month. You can look it up on travel.state.gov and look under the visa section. The minimum amount of time before these petitions will be valid for use, or current is 11 years from the time they are filed. For certain countries like the Philippines, it goes to 22 years.

This can't be speeded up. The lawyer has no control over it whatever. It's really a question of supply and demand. And as you can see from the wait times, demand is a lot higher than supply. So, based on the quote above, "as quickly as possible" is currently 11 years, or more. As noted, it might be possible for your sibling to qualify in some other way. For example, if you filed for your parents under the IR-5 category, and they came over and got green cards, they could file their own separate petition for your sibling, and if he's under 21, that would take 5 years, not 11.

Sibling Green Card

The answer is: you cannot accelerate it. No one can bring a sibling to US in 5 years, unless they applied in some other visa category (e.g. employment, parent for a child, etc).

The information from the lawyer's website is an advertising only. Even though they don's say that they can speed up the matters and overcome the Department of State waiting times.

Depending on your sibling's country of birth, the wait time would be no less than 11-12 years, and could be up to 20 (for Philippines).

It depends entirely on what country the person is from. Some countries have so many applicants for immigration lined up, that it can take 10 or 12 years. Other countries have fewer applicants and shorter waiting times.

An immigration attorney can only make sure your application is complete, accurate, and includes the proper supporting documents. That eliminates one cause of delays in processing. Other than that, an attorney can never get someone "to the head of the line," or anything else which would "speed things up." They cannot guarantee that the sibling will ever be approved, either.

If there weren't so many people clogging up the system trying to immigrate, and if there weren't so many immigration-law violators clogging up the system, and if their weren't so many people trying to get around the laws one way or another and clogging up the system, it wouldn't take so bloody long. It is simply an overloaded system, and we cannot take as many people as are trying to come. We are already overcrowded, traffic-jammed, short of water, etc, and our infrastructure is collapsing under the weight of too many people.

Sounds like a speel for the attorney to get your business.

There is no way to hurry up the process that the 'right' attorney can do for you. You just have to stay in line and wait until it goes thru.

The state department visa bulletin will give you the priority dates that CIS is using to process siblings of US Citizens for immigrant visas. Google it.