Meaning: Often those closest to a person don't benefit from the person's expertise
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In Chinese, I heard that "裁縫的孩子沒衣穿" or "the tailor's children want for clothing."
Garrison Keillor joked that the pastor's kids can't name the Holy Trinity after
you give them the Father and the Son, and the orthopedist told his boy with a
broken arm: "Just put some ice on." :)))