i am not kidding

I dreamt of my grandmother.
I dreamt I woke up to the feeling of somebody stroking my hair, and it was my grandmother.
She spoke to me this time. She was smiling so happily.. she looked different.
She asked me if her new clothes were nice, and my mom (in my dream) answered "Yes, of course, I 'burned' it for you". I remember her clothes were black, with pink flowers.
I asked her about my grandfather. And she said she "came alone, but will bring him back with her next time".

Upon waking up, I told my mother about the dream.
When I came back from college in the evening, she said "I told your dad about your dream just now. And he did 'burn' clothes for your grandmother on the eve of CNY. They were black with pink flowers".

I really did not know about this.
On the eve of CNY, I was in OUG the whole day so I couldn't have known that he even bought anything for my late grandparents.
Is this a coincidence?