Can I file for my husband and my parents at the same year?

Yes. You are not prohibited from filing multiple immigrant visa petitions. The issue often faced by individuals wishing to petition for multiple family members is the affidavit of support requirements. You will need to be able to demonstrate you have sufficient income and/or assets to spinsor three different individuals. The income requirements can be found on Form I-864P. If you do not have sufficient income and/or assets, you will require a joint sponsor. Otherwise, your family members may not be able to immigrate. You can read more about family immigration at http://myattorneyusa.com/family-immigration.