  We perform a general SU(3)$_F$ analysis of $b\rightarrow c\bar{c}s(d)$ decays
of members of the beauty baryon antitriplet to a member of the light baryon
octet and a singlet. Under several reasonable assumptions we found $\left\vert
\mathcal{A}(\Xi_b^0\rightarrow \Lambda S)/ \mathcal{A}(\Xi_b^0\rightarrow \Xi^0
S)\right\vert\approx 1/\sqrt{6}\, \left\vert V_{cb}^* V_{cd} / (V_{cb}^*
V_{cs})\right\vert$ and $\left\vert\mathcal{A}(\Lambda_b\rightarrow \Sigma^0
S)/\mathcal{A}(\Lambda_b\rightarrow \Lambda S)\right\vert \sim 0.02$. These two
relations have been recently probed by LHCb for the case of $S=J/\psi$. The
former agrees with the measurement, while for the latter our prediction lies
close to the upper bound set by LHCb.
