You can file Form I-730 within 2 years of receiving refugee/asylee status.

Your spouse and children must prove their relationship to you existed before your entry

The process can take several months and involves interviews at U.S. embassie

Your relatives will enter the U.S. as derivatives of your status, after 1 year, they too may apply for Green Cards

You can file Form I-730 (Refugee/Asylee Relative Petition) within two years of your arrival to bring your spouse and children to the U.S.