The petition for the parents will take about six months because they are immediate relatives. The sister's petition will take about twelve years. She is classified as an F-4, sister of a US citizen.
The answer provided here is general in nature and does not take into account other factors that may need to be reviewed for a more precise answer. You should consult with an immigration attorney before taking any action. The answer here is not intended to create an attorney-client relationship.
Fr parents of a USC it's "immediate priority" , can apply right away. For your 11 year old sister, however, it's another story altogether. A siblings petition can take anywhere between 10-14 years from the time of petitioning, under current law.
If your parents are in the US, then can immediately file for adjustment of status with USCIS. Will get EOIR green cards within 4-5 months.
If there are abroad, you will then need to file with USCIS first, then will have to deal with the National Visa Center, as well as the US consulate I their home country. Can take anywhere from 9 to 18 months to complete and get here.
Behar Intl. Counsel 619.234.5962 Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
I agree, but want to clarify that the processing time through USCIS is different than completing the visa process through both USCIS and the State Department's National Visa Center. In other words, it can take longer than nine months, even a year, for an immediate relative to clear both Agencies. Some may have other complications, but usually this is not the situation.
As for your eleven year old sister, this can create a controversy. The processing times for the Philipines exceed twenty years at times. Some countries take longer than others due to U. S. Immigration Quotas. Your parents may not immigrate if your sister will remain without parents in her home country.
From time to time, efforts are made to overcome these situations. However, the options may create additional complications. That is why you should seek legal advice from a competent and experienced immigration attorney before you spend too much money on a process that may be abandoned. Good luck.
This is general information, not legal advice, and does not create an attorney client relationship.