Curious question - why do people say they want kids to "carry on the legacy" when more often then not there's no legacy?

When one thinks of legacy they think of someone who has achieved something in life. Has started their own business. Saved other people's lives as a stranger, not as part of the job. And anything along those lines. Done something that'll make people remember them.

A legacy isn't > I went to work - did the basics required for my job - went home and did it all over again the next day. Legacy isn't being a number or a cog in the wheel of the world.

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So what "legacy" are the kids carrying on?

And don't say surname when just as likely to have a daughter who won't "carry on" the surname if she's married.

Curious question - why do people say they want kids to "carry on the legacy" when more often then not there's no legacy?
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