yeah dd_sh is right. calling your brother for your pregnancy help will put the whole idea into suspicion. There is a chance that your mother will not even get the visa, if they doubt about it.  Unless, your brother is able to show that he is well set up there in nepal and has huge income and a huge bank account,  they will surely reject him. there is no doubt about it. you can try your sister, but not your brother. dont try it. bad idea.