StarA

Applying at 1 year and 9 months is perfect. My husband applied to remove conditions at 1 year 10 months and received a letter within 2 weeks that says, "your conditional resident status is extended for a period of one year (while application is pending). During the one-year extension you are authorized employment and travel." So, unless something is wrong with your application, you should get a temporary one year extension while your application is pending. It should come within weeks of receipt of your application. HOPEFULLY!

I said "after biometrics"

Wrong. the NOA1 is sent BEFORE biometrics and that has the extension on it. That is the paper you bring with you when you travel.

Correct.

when you first send in your 1-751 they send your a receipt notice NOA-1 that letter is also your one year extension for your permanent resident card.then about 3 or 4 weeks later you should receive another for appointment for biometrics in 4 weeks in your local immigration center, when you get that letter try to do a early walk in biometrics after thats done you can traval. if every thing goe's well the back round checks in about 5 weeks hope the next letter should be NOA-2approval,

No that doesn't count. You have to have your green card through marriage for 3 years before applying.
You should apply for your green card (10 years) within 90 days before the current GC expiration date.

If USCIS receives your case 1 day before that 90-day mark, your case will be rejected and sent back to you to do it again. There is no reason to try to beat the clock and send it on the first day possible. If it were me (and I were you), I'd mark my calendar on Jan 02, 2012 as the date to send in the I-751.

Yes - in your case, anytime between Jan 01, 2012 and March 31, 2012. (Don't come early and don't be late.)

when your card expires, I have heard about people that send it 1 or 2 days before the card expires.
It is not recommendable at all

I really cannot say how they did that, but the timeline hasn't changed a bit. I'm a single child of a USC over 21. My mom filed for me in 1999, it took me 5 1/2 years to get my GC. Could you get the date that the i130 was filed and when it was approved? What was their priority date?
Q2 you count her salary depending if she is a USC or LPR, but you have to count her anyway as part of your household size.

Limited Family-Based Immigrants
These types of immigrant classifications involve specific, more distant, family relationships with a U.S. citizen and some specified relationships with a Lawful Permanent Resident. Under immigration law, there are fiscal year numerical limitations on family preference immigrants as explained below.
* Family First Preference (F1): Unmarried sons and daughters of U.S. citizens, and their children, if any. (23,400)
* Family Second Preference (F2): Spouses, minor children, and unmarried sons and daughters (over age 20) of lawful permanent residents. (114,200) At least seventy-seven percent of all visas available for this category will go to the spouses and children; the remainder will be allocated to unmarried sons and daughters.
* Family Third Preference (F3): Married sons and daughters of U.S. citizens, and their spouses and children. (23,400)
* Family Fourth Preference (F4): Brothers and sisters of United States citizens, and their spouses and children, provided the U.S. citizens are at least 21 years of age. (65,000)
When you receive your citizenship
You can apply for parents and obtain an immediate visa number (it still takes months to file the paperwork and obtain the visa).
For you as a USC your siblings fall into category F-4 (brother/sister of USC)in waiting for a visa number. The current wait time for category F-4 is about 10 years.
If your siblings are not married your parents can file for them when they receive their green card as category F2 with a wait time of about 4 years.
If the siblings are married you must either file for them after you become a USC or your parents can file for them when they become USC (category F3, wait time about nine years).
Q1 No idea how they got here so fast.
Q2 It is not 18,000 per immigrant, it is a scale based upon the number of people in the household and how many people you are immigrating.
2. 2009 Poverty Guidelines for the 48 Contiguous States and the District of Columbia:
Size of Family Unit Poverty Guidelines 125% of Poverty Guidelines
1 $10,830 $13,538
2 14,570 18,213
3 18,310 22,888
4 22,050 27,563
5 25,790 32,238
6 29,530 36,913
7 33,270 41,588
8 37,010 46,263
So for example it is you and your spouse and you are bringing your parents (two people) that would make a total of four. The sponsor must have an income of 27,563.
Q3. They cannot come to the US to wait for an immigrant visa. They may come to visit while complying with the terms of their visa/VWP.
Again keep in mind that things can change. The poverty guidelines I provided are for 2009, they change every year. The wait times change monthly. And immigration reform can happen at any time.