Immigration law will not let you file for a green card for your parents or brothers now -- unless you become a U.S. citizen. Depending on how you got your green card, your eligibility for U.S. citizenship is three to five years away. (For more information, see Nolo's Becoming a U.S. Citizen: A Guide to the Law, Exam & Interview.)

After you become a citizen, your parents become your "immediate relatives," in immigration law lingo. When you file visa petitions for them, they'll be eligible to immigrate right away. Your brothers won't be so lucky. When you become a citizen, you can file visa petitions for them, regardless of their age and whether or not they're married. But they'll become "Fourth Preference" relatives, and be put on a waiting list for a visa. The wait can be very long -- in fact, the Philippines holds the current world record with an approximate wait for brothers and sisters of 22 years.

A tourist visa, on the other hand, can be gotten in a few days. Being approved for one is not automatic -- your family members will have to prove that they aren't trying to get into the U.S. permanently and that they can support themselves once they're here. (Once you become a citizen and file visa petitions for them, proving their intent to return will become harder.)

But once they've got the visa, it will probably be good for many trips to the United States. On each visit, they'll be allowed to stay between three and six months. So, you might want to get that extra bedroom ready after all. Just make sure they leave on time during every one of their visits -- otherwise all manner of things could go wrong with their eventual hopes of immigrating. For more information on getting and using a tourist visa, see Student & Tourist Visas: How to Come to the U.S.