The author uses ethos (author credibility and trust in their credentials) by using the word "our" so often. This places the author in collaboration with the reader, showing that he believes that they are all one and working together to achieve a common purpose.
During the first five years of a child's life, trust and self-confidence are developed when D. consistent, nurturing care is present in the environment
hope this helps
Maybe it's because not everyone can cope with each other after such a long time. Maybe not everyone has great social skills after living together for awhile.
