MIND SHIFT
In order to be called a child of God you need to have believed in Jesus Christ His son. John 1:12-13 tells us to all who believe ,God gives the right to become children of God. If you have not believed in Jesus and committed to a forever relationship with Him you are not His child.
In a household hired hands do not get an inheritance. They may work very hard be awesome people and better behaved than the children of the house , but they are not entitled to an inheritance. You can do as many good deeds as you want , your life can put Christians to shame, but unless you are a child of God you will not get an inheritance from God. Only the children get that. But as already stated all you need to do to become a child of God is to believe in Jesus.