When the world is at peace, what does it mean for a family to be willing to question those rich people?

My humble opinion: Literally speaking, to be in harmony with heaven is to conform to God's will, and God's will is often called Tao, which is the law of things' development. It doesn't depend on people's will. If it conforms to it, it will prosper. The meaning of couplets is very clear. If the world (country) is peaceful, the family can be harmonious, and if the country is good, the family can be small. If this couplet has any specific meaning, it is another matter.