This chapter reads as though it could apply equally to the natural family as to the Christian family; the sacrament of marriage makes no difference. It feels as though the Pope is looking here at the family as a human reality, and not as a Christ-centred one. The title of the chapter itself seems strange.
However, there are indications to the contrary. In paragraph 11 he says, “fruitful love becomes a symbol of God’s inner life.” Indeed, human beings are nothing without God.
Later in paragraph 11 the Pope mentions the mystery of the union of Christ and the Church. But this is the centre and foundation of marriage!
Again in paragraphs 27-30, the family is spoken of as a natural reality, but with a semi-Pelagian possibility – that we can make our families better if we try. That if we try to live well, God will bless our family.
No, the key to marriage and the family is the Nuptial Union between God and humanity and not mere human virtue. Living with God creates virtue and blessing!
The Pope seems to be telling people how they can make their families better on their own when I would expect him to proclaim the truth about marriage and the family.