My fiance is living here on a TN Visa which expires in Dec. We live in Calif. We will be married in Sept of this yr. We are planning on filing paperwork to get his work permit and his Green Card. By applying for a work permit will this null and void his TN Visa? Will he still have to get another TN Visa when this one expires if he doesn't have approval for the work permit at that time? Will I still have to file the Fiance form even though he has been here for 3 1/2 years on his TN Visas? He owns a house in So Cal will this cause complications?