con nhà tông không giống lông cũng giống cánh

Etymology
One (obsolete) variant of this phrase is attested in the Dictionarium anamitico-latinum (1772 manuscript) as.

Considering that both variants contain and, it is likely that the obsolete one, which has , is more conservative of the two. The modern form arose from the substitution of for its rhyme.

Proverb

 * 1) like father, like son