Tenant Rights in Houston,Tx?

My fiancee and I live in Houston,Texas and got married today. We also have a daughter who is a month old. He has had an apartment which he just renewed his lease with for 2 years. Now the apt has new management. I live with my mom.I called the leasing office today and she said even though we're married and hes currently under a lease I fill out an application like I'm applying for an apartment. So I have 2 questions 1. Since we married today can I use my married name on the application or do I have to wait until I've changed my name with the social security office and DPS? Also she said even though we're married if I stay there for more then three days he will be given 24 hours to vacate. I thought when a couple is married they only have to fill out one application since they are married. I have no problem doing the application and appliation fee but can they legally evict him for his wife living there? I asked for the property management company and they refuse to give it 2 me.