Dream of mother

I dreamed about my deacesed mother dying again in my dream , in my dream my sister comes in and we are not so concerned about our mum passing, and the feeling as almost like we did not care or if we are not chocked at all, and we are Always trying to not tell people that she passed, but it is Always my sister giving the idea of not telling yet , and its a recurring dream, i had the same dream ,the same sister coming in, same scenario ,and feeling, is more like no pain for our mothers death.