  Production of neutral and doubly charged partners, $\hat F_I^0$ and $\hat
F_I^{++}$, of $ D_{s0}^+(2317)$ as a charm-strange four-quark meson is studied
in relation to observations of $D_{s0}^+(2317)$. It is discussed that
observation of $\hat F_I^{++}$ in inclusive $e^+e^-\to c\bar c$ is difficult
but it might be observed in $B_u^+\to D_s^+\pi^+D^-$. Observations of $\hat
F_I^0$ and $\hat F_0^+$ might be possible in hadronic B decays.
