  The new members of the charm-strange family $D_{sJ}^{*}(2317)$,
$D_{sJ}(2460)$ and $D_s(2632)$, which have the surprising properties, are
challenging the present models. Many theoretical interpretations have been
devoted to this issue. Most of authors suggest that they are not the
conventional $c\bar s$ quark model states, but possibly are four-quark states,
molecule states or mixtures of a P-wave $c\bar s$ and a four-quark state. In
this work, we follow the four-quark-state picture, and study the masses of
$cn\bar n\bar s/cs\bar s\bar s$ states ($n$ is $u$ or $d$ quark) in the chiral
SU(3) quark model. The numerical results show that the mass of the mixed
four-quark state ($cn\bar n\bar s/cs\bar s\bar s$) with spin parity $J^P=0^{+}$
might not be $D_s(2632)$. At the same time, we also conclude that
$D_{sJ}^{*}(2317)$ and $D_{sJ}(2460)$ cannot be explained as the pure
four-quark state.
