Definition 107.22.2. Let $f : X \to S$ be a family of curves. We say $f$ is a *stable family of curves* if

$X \to S$ is a prestable family of curves, and

$X_ s$ has genus $\geq 2$ and does not have a rational tails or bridges for all $s \in S$.

Definition 107.22.2. Let $f : X \to S$ be a family of curves. We say $f$ is a *stable family of curves* if

$X \to S$ is a prestable family of curves, and

$X_ s$ has genus $\geq 2$ and does not have a rational tails or bridges for all $s \in S$.

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