can I get my grandson and daughter in law to Unitrd States from Bulgaria

You cannot petition for your daughter-in-law and grandson. You could only petition for your son. Your daughter-in-law and grandson could benefit from the petition you file for your son but only if he is issued a visa. Given he is currently in jail, there is a good chance he would not be eligible for a visa though a definitive assessment could not be made without knowing why he is in jail. You can read more about family immigration at http://myattorneyusa.com/family-immigration.