By law, only the spouse, minor child, or parent of a US citizen ("immediate relative") are "immediately" eligible for their green cards. For all other family petitions, there is a backlog or waiting period for green cards:
1. F-1 - single adult child of citizen
2. F-2A - spouse and/or minor child of green card holder
3. F-2B - single, adult child of green card holder
4. F-3 - married child of citizen
5. F-4 - brother/sister of citizen.
This waiting period can be anywhere from 4 to 30 years, depending on:
1. the status of the petitioner (immigrant or US citizen),
2. the age (under or over 21),
3. marital status (married/unmarried) of the person being petitioned, and
4. the relationship of the family member to the petitioner (husband/wife, parent/child, brother/sister).
Just because a person has an approved petition, does not mean that they are in immediate legal and/or working status. In fact, on the back of the Approval Notice, it specifically states:
"The filing of an application or petition does not in itself allow a person to enter the United States and does not confer any other right or benefit.
A person is not guaranteed issuance of a visa or a grant of adjustment simply because this petition is approved. Those processes look at additional criteria." (Emphasis added)
As you can see, except for "immediate relatives", the approval of a family petition does not confer any immediate rights or benefits to the person being petitioned. The family member must still wait several more years until their priority date is current (or the visa is available), before they are able to legally enter, live, and work in the United States. Until their visa is available (or priority date is current), they would be without legal status and, technically, deportable/removable if caught (unless they have some other type of authorization or visa to live and/or work in the US).
If you or a family member are under a family petition and are impatient with the long waiting time involved for the visa to become available, you may wish to consider other ways for the family member to be petitioned, such as through employer sponsorship (called Labor Certification/PERM ). Remember, if a person has already been petitioned by a relative, they can still be petitioned for a green card through as many different ways as are legitimately available to them, all at the same time. (In addition, under Section 245(i), if a petition was filed for you before April 30, 2001, it is possible for you to be interviewed in the US for a green card even under a new Labor Certification/PERM application filed by an employer after April 30, 2001.) You should see a reputable attorney, who can advise you and your family of possible faster ways for the relative to immigrate to the US.
Four offices to serve you:
PHILIPPINES: 894-0258 or 894-0239
LOS ANGELES: (818) 543-5800
SAN FRANCISCO: (415) 538-7800
NEW YORK: (212) 808-0300.