Conversation so far:
When did Frasier Crane reunite with Lilith Sternin and Frederick Crane?
In The Show Where Lilith Comes Back (1994), Lilith Sternin surprises Frasier Crane by dialing to the radio show.
Is Frasier Crane reunited with Frederick Crane?
Frasier Crane and Lilith Sternin decide to remain friends and help each other raise their son Frederick Crane, who also appears occasionally in this spin-off.
What else happens in the reunion episode?
In Adventures in Paradise, Part Two (1994), Lilith Sternin gets engaged to her fiancé Brian Patchett.

Question: How does Frasier react to the engagement?
Self-contained rewrite: How does Frasier Crane react to Lilith Sternin's engagement to Brian Klugman in the Frasier episode Adventures in Paradise, Part Two?