Apostate prophet best of judges; Why females get half inheritence?

In answer to the video "10 Reasons to Reject Islam"

The husband is bound by the Islamic sacred law to take care of his parents, wife, children even if mature enough to work but are still unmarried. So the income he makes isnt really his income but belongs to the welfare and maintenance of his family. That is besides his other, religious duties for which he must contribute, including governement taxes and military jihad if required for the safeguard of his community.

The wife is not bound by Shariah to provide any kind of material need to the family or husband, and any income she makes belongs to her and no one else. She will even benefit from the wealth passed on by her deceased husband to other close family members. The inheritance is based on those presuppositions. If these presuppositions dont apply, in cases where a woman is sustaining herself and the family instead of a man, then the law doesnt prevent the wealth to be distributed as anyone deems it fit prior to death.

As a final note, the portion of a woman varies, it isnt fixed, and depends on whether she is a wife, mother, only sister or one of the sisters. Sometimes she may get the double of a man. If a woman dies and is survived only by her husband, mother and father, then the husband inherits 1/2, the mother 1/3 and the father 1/6.