God creates the family, therefore he is the one that gets to define it and determine how it functions. He also is the one who determines the reason the family exists in the first place. In Genesis 1 and 2, we see that God gives the gift of the family unit because man is humanity in the image of God. Part of what it means to image God is that we’re made for relationships. Another part of what it means to image God is that we’re given the vocation of ruling over God’s creation on his behalf. Ultimately, God sends our Savior through the means of humanity obeying this creation mandate, and when he comes, he ultimately fulfills it by making God’s kingdom manifest on the earth.
RESOURCES: ESV Study Bible; Bound For Glory by RC Sproul Jr; God and Sex by Matt Chandler; Created and Creating by William Edgar