Apply for brother's immigration

First of all, you have to get married for a year before your husband can be your co-guarantor. Secondly, I estimate that your income is not enough for you to guarantee your parents and brother at the same time. Now, if you want to apply for parents' immigration as soon as possible, your brother will rely on luck. But in any case, he can get extra points from his relatives when he applies for skilled immigration in the future.