At some unspecified time in the remote past, God created also the angels – to be His sons or children. During those days of Earth's formation week, and before the Lord made man, His angelic sons or children praised Jehovah every morning. Job 38:4-7. Perhaps this too was intended to set an example for Adam and Eve and their children to follow – after God later created them, as His final masterpiece, to serve and to worship Him forever.
God finally made man and woman, as His very own image. Genesis 1:26. The Divine Family within the Triune God then commissioned mankind to form human families – and also, as such, to worship the Lord. Genesis 1:27f. Giving mankind that Great Commission, God then sabbathed. Genesis 2:1-3.