Y dies intestate. Her son, A has predeceased her. Y is survived by the following relatives: Her daughters, C and D; her grandson, F (the child of A). Y's estate amounted to R900 000. How will Y's estate devolve?

Since Y dies intestate, the laws of intestate succession will determine how her estate will devolve.

Firstly, since Y's son, A, has predeceased her, A's share of the estate will not be inherited by him. Instead, it will be passed down to A's descendants, which in this case is his son, F.

The estate will be distributed as follows:
- The daughters, C and D, will each receive an equal share of the estate, which amounts to R900,000 ÷ 2 = R450,000 each.
- The grandson, F, will inherit the portion that would have gone to his deceased father, A. Therefore, F will receive R450,000.

So, the estate will devolve with C and D receiving R450,000 each, and F receiving R450,000.

When a person dies intestate (without a will), the devolution of their estate is determined by the laws of intestacy in their jurisdiction. Since you have not specified a jurisdiction, I will provide a general overview of how the estate may devolve.

In many jurisdictions, the estate of a person who dies intestate typically passes to their closest living relatives in a specific order. Here is a possible scenario based on the information provided:

1. Since Y's son A has predeceased her, his share of the estate does not pass directly to him but to his descendants if any.

2. Y is survived by her daughters C and D. If there are no other relatives, the estate will usually be divided equally between them. Therefore, in this case, both C and D would receive half of the estate.

3. Y's grandson F, who is the child of A, may be entitled to receive the portion that would have gone to his deceased father A. Assuming there are no other descendants of A, F would receive the entire portion that would have been allocated to A.

So, the estate may be devolved as follows:
- C and D will each receive R450,000 (half of the estate)
- F will receive R450,000 (the portion that would have been allocated to A)

Keep in mind that specific laws and regulations in the relevant jurisdiction will determine the exact devolution of the estate, so it is important to consult with a legal professional for accurate advice in your specific situation.