  We exploit the precise parallaxes and proper motions contained in Gaia Data
Release 2 (DR2) to establish whether the proposed wide-separation companions to
five nearby, young stars are in fact equidistant and comoving with these stars.
For three of the proposed wide pairs --- TW Hya + 2M1102-34; HR 4796A +
2M1235-39; and V4046 Sgr AB + GSC 07396 --- the Gaia DR2 data confirm that the
two stars lie at the same distance and are comoving (or nearly so), to within
the measurement errors. We conclude that these three pairs indeed constitute
wide-separation binaries with projected separations of 44.3 kau, 13.3 kau, and
12.3 kau, respectively. In contrast, the DR2 data disprove the hypothesis that
T Cha + 2M1155-79 and HD 113766AB + TYC 8246-2900-1 constitute wide binaries.
Future investigations of the three wide young-star pairs confirmed in this work
should be aimed at establishing whether they remain bound at the present epoch
and whether the presence of long-lived disks orbiting the primaries is linked
to the orbital or dissolution timescales of these wide binaries.
