Praise be to Allaah.
If a man dies leaving wealth and leaves behind two wives, a
son and a daughter from the first wife and a daughter and three sons from
the second wife, and his estate was one hundred thousand riyals, then it is
to be divided as follows:
The wives get one eighth, to be divided between them, because
Allah, may He be exalted, says (interpretation of the meaning):
“…their (your wives) share is a fourth if you leave no
child; but if you leave a child, they get an eighth of that which you leave
…”
[an-Nisa’ 4:12]
The children get the rest, with each male getting the share
of two females, because Allah, may He be exalted, says (interpretation of
the meaning):
“Allah commands you as regards your childrens
(inheritance); to the male, a portion equal to that of two females”
[an-Nisa’ 4:11].
When the estate is divided, each wife gets 6,250; each son
gets 17,500 and each daughter gets 8,750.
And Allah knows best.