Jesus fulfilled the Sabbath law by doing God's will. Christians, under The New Testament are not required to observe the Sabbath or any other holy days of the Old Testament. These days were given to the Nation of Israel and the full meaning of their celebration was true of Jesus Christ. Jesus is our rest. We cease from our dead works and rest in the Grace of God.
Christians do enter a spiritual rest which is now no longer just one day.
Every day belongs to the Lord in The New Covenant. There are many scriptures in The New Testament regarding the Jewish Sabbaths and Holy Days. This is the only commandment with a promise and the first of them to be addressed about and for people. Parents are to be respected and loved, to be obeyed and to be served by their children with gladness. Parents are God's representatives and children are to especially see to their needs and care for them.