Musannaf Ibn Abi Shaybah 33419 — Those who used to say: when

Abdullah bin Dhakwan reports that Kharijah bin Zayd (may Allah have mercy on him) said: When the grandmother on the mother's side is nearer than the grandmother on the father's side, the sixth share of the estate will go to her alone; and when the grandmother on the father's side is nearer than the grandmother on the mother's side, the sixth share of the estate will be divided between the two of them.