The facts posted are less than convincing. You are playing hide and seek with the facts. What prevents you from posting comprehensive material facts instead posting facts, that too, irrelevent and inconsistent, in bits and pieces rendering the participants in this public forum incapable of offering any meaningful suggestion. The foollowing aspects are material and elementary, unless this is purely an academic issue:
1. Who had been the owner of the property - was it ancestral or self-acquired -if ancestral, how?
2. Who are the legal heirs - was the property left intestate, i.e. no Will was executed?
3. Was any partition deed(s) or settlement deed(s) executed?
4. Why the grandmother, not your mother has filed the partition suit? Why your mother is not even a defendant?
It is amtter within your deiscretion to provide the requisite information. But kindly avoid misleading information.