  To investigate the formation process of multiple systems, we have analyzed
the ALMA archival data of the 1.3 mm continuum, $^{12}$CO (2-1) and C$^{18}$O
(2-1) emission in a proto-multiple system consisting of a Class 0 protostar
Per-emb-8 and a Class I protobinary Per-emb-55 $A$ and $B$. The 1.3 mm
continuum emission is likely to primarily trace their protostellar disks, and
the Keplerian disk rotation is observed in Per-emb-8 and Per-emb-55 $A$ in the
emission lines. In Per-emb-8, we identify two arm-like structures with a length
of $\sim$ 1000 au connecting the eastern and western of its disk in the
continuum and C$^{18}$O emission. Our analysis suggests that these arm-like
structures are most likely infalling flows. In the $^{12}$CO emission, we
discover a second bipolar outflow associated with Per-emb-8. The two bipolar
outflows in Per-emb-8 are possibly launched along the normal axes of the
misaligned inner and outer parts of its warped protostellar disk. In
Per-emb-55, we find that the red- and blueshifted lobes of its bipolar outflow
are misaligned by 90$^\circ$. The presence of the warped disk, multiple
misaligned outflows, and asymmetric infalling flows suggest complex dynamics in
proto-multiple systems, and these could be related to the tidal interactions
between the companions and/or the turbulent environments forming this
proto-multiple system.
