am I a bad wife to be? -- UPDATED

My husband to be asked me to transfer all my life savings into his account so that he could make a visa application for his mum to come to the country for our wedding and that he will pay me back after the application...He said he would not use the money but wants it in his account as evidence that he could look after his mother when she comes and apparently the immigration will ask for his bank statement?... this arrangement does not sit well with me at all. We are not even married yet! I have been thinking about saying no to him, but wouldn't that make him lose his trust for me  and make me look like a bad woman? I am 26 and my husband is 35. This is my whole life savings and also some of the money will go towards our wedding costs.. I just don't know what to do