I think you are ignoring the context.
3 As I urged you when I went into Macedonia, stay there in Ephesus so that you may command certain people not to teach false doctrines any longer 4 or to devote themselves to myths and endless genealogies. Such things promote controversial speculations rather than advancing God’s work—which is by faith. 5 The goal of this command is love, which comes from a pure heart and a good conscience and a sincere faith. 6 Some have departed from these and have turned to meaningless talk. 7 They want to be teachers of the law, but they do not know what they are talking about or what they so confidently affirm.
Threads that insist on one’s (Jewish) heritage or one’s (noble family) line for salvation is distorting the gospel.
But when the Bible’s authors bring up Jesus as part of a family, it has many lessons for us.
Americans tend to live as isolated lonely individuals so only see themselves as important. (the “me” generation is how Tom Wolfe describes this culture).
Most other cultures see a person as part of a large loving family, and when Paul writes that Christians are part of the “household of God” he was talking about the large families of those days, where different people had different ways of belonging to the family (mother, father, kids, grandparents, spinster aunt, disabled uncle, the cook and the maid) and as part of this family we love and care for each other...
If you read the Bible, and not just take verses out of context, you will see that it is not a book dictated by God with simple answers, but often different books present the dilemmas of man from different points of view: the bible is not a magic book with pat answers, but the living word of God.
In fact most cultures view the family as integral. It’s only the culture of death that does not. The Church is one big family, across the World, throughout time, led by Jesus Christ.