How are 12,000 Saudi Riyals to be distributed among a mother, seven daughters, and four sons?

If the deceased has no heirs other than those mentioned, the inheritance is divided as follows:

1. If the "mother" is the deceased's mother:

The mother receives one-sixth (2000 Riyals); based on the Almighty's saying: (and for his parents, each of them the sixth of what he left, if he had a child).

The remainder goes to the children; the male receives the share of two females (each male gets 1333.3 Riyals, and each female gets 666.7 Riyals); based on the Almighty's saying: (Allah instructs you concerning your children: for the male, what is equal to the share of two females).

2. If the "mother" is the deceased's wife:

The wife receives one-eighth (1500 Riyals); based on the Almighty's saying: (But if you have a child, then for them [the wives] is one-eighth of what you leave).

The remainder goes to the children; the male receives the share of two females (each male gets 1400 Riyals, and each female gets 700 Riyals).

And Allah knows best.