If there is no will
If there is no will and no surviving spouse/civil partner of the deceased parent then the children share the net estate between them. If there is no will but there is a surviving spouse/civil partner the children share 1/3 of the net estate between them.
If there is a will
A child has no absolute statutory entitlement or right to receive anything under the will of the parent. Instead a child has a right to make an application to court and request the court to make provision out of the estate if the child can prove to the court that the parent has failed to provide for the child.