You can become a lawful permanent resident based on the fact that you have a relative who is a citizen of the U.S. or a relative who is a lawful permanent resident. Green Card through family members falls under two basic categories: Unlimited and Limited.
Preference GC is Suitable For:
Foreign nationals married to U.S. Permanent Residents (Green Card holders)
Unmarried children (any age) of U.S. Permanent Residents (Green Card holders)
Unmarried stepchildren of lawful permanent residents, if the marriage creating the stepchild relationship took place before the child's 18th birthday
U.S. Permanent Residents to sponsor the Green Card application of their foreign spouse or unmarried children (any age)