What was your exact case if you may tell pleaseHey Brother, I have done the same mistake you going to do now. Never ever include the TRV visa application of your parents or in-laws with yours or your family, I got refusal for both my mother-in-law and father-in-law. Once you get the refusal its always difficult to get approval next time. I tried again for my father-in-law but they rejected so I honestly suggest you to wait for your mothers TRV application until you land here and if all the documentation is appropriate she will get approval in due time.