This idiom means that family members are more important than anyone esle, and should be the focus of a person's efforts.
Chase rainbows
If someone chases rainbows, they try to do something that they will never achieve.
Chew the cud
If you chew the cud, you think carefully about something.
Chew the fat
If you chew the fat with someone, you talk at leisure with them.
Chickenfeed
If something is small or unimportant, especially money, it is chickenfeed.
Chip off the old block
If someone is a chip off the old block, they closely resemble one or both of the parents in character.
Clean as a Whistle
If something is as clean as a whistle, it is extremely clean, spotless. It can also be used to mean 'completely', though this meaning is less common nowadays.
Clean bill of health
If something or someone has a clean bill of health, then there's nothing wrong; everything's fine.
Clean slate
If you start something with a clean slate, then nothing bad from your past is taken into account.
Clear as mud
If something is as clear as mud, then it is very confusing and unclear.
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