Ravindra From Mumbai want legal help in Property / Ancestral Property / Will

Property in the name of my uncle who expired no will.
Bed ridden aunty expired on 23rd October she wrote half property to her neice.
can she claim the half property legally.
Aunty was totally bed ridden and surviving on oxygen she was not in a position of writing any thing.
can l challenge the will since the will was signed in sub conscious mind.