。
Family before strangers.
Literal
Others [than-より] blood-relatives.
An extreme example of ellipsis: a complete sentence with no verb at all, just a comparative phrase. The particle より marks 'than (strangers)' and the implied comparative predicate is something like 'is more important' or 'comes first.' 身内 ('blood relatives, inner circle') contrasts sharply with 他人 ('outsiders, non-relatives') — this binary is a recurring theme in Japanese social thinking.