http://en.wikipedia.org/wiki/Extreme_hardship
http://www.visajourney.com/forums/topic/316-how-do-i-prove-extreme-hardship/
- Wish you have read above links and understand, before you suggested such.
If your second child's age is below 1 year, you still have chance to apply for something due to the one-child policy in China.
- Guess it would be inside information
BTW, she is a mother of 5 and 2
http://web.wenxuecity.com/BBSView.php?SubID=immigration&MsgID=460688
The last option is your children can apply for your immigration when they are 18(or 21?) years old.
- It is 21.
So you believe she has less possibility to get married to a USC, within next 16 years.