  We consider the Beilinson--Bloch heights and Abel--Jacobian periods of
homologically trivial Chow cycles in families. For the Beilinson--Bloch
heights, we show that for any $g\ge 2$, there is a Zariski open dense subset
$U$ of $\mathcal{M}_g$, the coarse moduli of curves of genus $g$ over
rationals, such that the heights of Ceresa cycles and Gross--Schoen cycles over
$U$ satisfy the Northcott property. For the Abel--Jacobi periods, we provide an
algebraic criterion for the existence of a Zariski open dense subset of any
family such that all cycles not defined over $\overline{\mathbb{Q}}$ are
non-torsion and verify that this criterion holds for Ceresa cycles and
Gross--Schoen cycles.
