Gmail – How to filter Follow-Up Emails in Gmail

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I create a filter for someone's email and it automatically goes to a folder.
For all of his following emails, they go into that folder. But for anyone who REPLIES to His email it goes directly in my inbox.
Is there a setting in Gmail that will filter these replies (follow-up) emails into the same folder as the sender's?

Best Answer

It seems you have a filter like this:

from:jdoe@gmail.com
apply label: jdoe_messages

The simplest way to have messages from John Doe, as well as message sent to him, is:

has the words: (from:jdoe@gmail.com OR to:jdoe@gmail.com)
apply label jdoe_messages

That way, any message from John Doe, or with John Doe's email address in the to: field, will be seen by the same filter.