If you have seen your sister-in-law's brother in a dream: Even though some events seem to disrupt the plans, they may play a role in the realization of your goals in a shorter time, your good plans with those around you will come into play. To see your sister-in-law's sister in your dream refers to spending a good time with your loved ones, being happy and holding on to life tightly, financial and moral comfort and a smile on your face.