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Please see this link:
http://travel.state.gov/visa/frvi/bulletin/bulletin_4252.html
FAMILY-SPONSORED PREFERENCES
First: Unmarried Sons and Daughters of Citizens: 23,400 plus any numbers not required for fourth preference.
Second: Spouses and Children, and Unmarried Sons and Daughters of Permanent
Residents: 114,200, plus the number (if any) by which the worldwide family preference level exceeds 226,000, and any unused first preference numbers:
A. Spouses and Children: 77% of the overall second preference limitation, of which 75% are exempt from the per-country limit;
B. Unmarried Sons and Daughters (21 years of age or older): 23% of the overall second preference limitation.
Third: Married Sons and Daughters of Citizens: 23,400, plus any numbers not required by first and second preferences.
Fourth: Brothers and Sisters of Adult Citizens: 65,000, plus any numbers not required by first three preferences.
Your parents (any one of them) can sponsor you for residency. you will fall under Preference 2B : Unmarried Sons and Daughters (21 years of age or older)
| Fam-ily | All Charge- ability Areas Except Those Listed | CHINA-mainland born | INDIA | MEXICO | PHILIPP-INES |
| 1st | 15MAR02 | 15MAR02 | 15MAR02 | 22JUL92 | 15MAR93 |
| 2A | 01AUG03 | 01AUG03 | 01AUG03 | U | 01AUG03 |
| 2B | 15SEP99 | 15SEP99 | 15SEP99 | 08APR92 | 01MAR97 |
| 3rd | 08JUN00 | 08JUN00 | 08JUN00 | 08AUG92 | 01APR91 |
| 4th | 01SEP97 | 15FEB97 | 15FEB97 | 22DEC94 | 08MAR86 |
At present, people who got sponsored before 15Sep1999 are getting GC. So there is a wait for 9 years which will be even longer as the petitions keep on piling up. This is the fastest time you can get residency by your family sponsor.
If you marry a green card holder, your preference moves to 2A, whch has a wait of 5 years, still not very exciting!
Marry a citizen, GC will fall in your lap right away!
Disclaimer: I am not an attorney .. this is not legal advice!