Praise be to Allah.
Your grandmother has a one-sixth share of her daughter’s estate, because her daughter had offspring who inherited from her, namely you and your siblings, if you have siblings.
Allah, may He be exalted, says (interpretation of the meaning):
{And for one’s parents, to each one of them is a sixth of his estate if he left children} [an-Nisa’ 4:11].
Based on that, your grandmother inherits one sixth of the estate left by your mother, who died when she still owned that wealth, including property, money, furnishings, gold and other possessions.
With regard to what she gave as gifts or sold whilst she was still alive, that is not included in the estate; it belongs to the one to whom it was given or sold.
With regard to what her husband gave to her to make use of after he died, that is a bequest, and it is not included in the estate, because ownership does not move to the one to whom the bequest is made except after the death of the testator. We understand from your question that your mother died before your father, so this bequest was annulled.
Moreover, it is not permissible to make a bequest to an heir [one who inherits a prescribed share of the estate].
See also the answer to question no. 10447 .
And Allah knows best.
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