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This work studies the candidate double and multiple open clusters (OCs) inthe galactic sector from l = 240o to l = 270o, which contains the Vela-Puppisstar formation region. To do that, we have searched the most recent andcomplete catalogues of OCs by hand to get an extensive list of 22 groups of OCsinvolving 80 candidate members. Gaia EDR3 has been used to review some of thecandidate OCs and look for new OCs near the candidate groups. Gaia data alsopermitted filtering out most of the field sources that are not member stars ofthe OCs. The plotting of combined colour-magnitude diagrams of candidate pairshas allowed, in several cases, endorsing or discarding their link. The mostlikely systems are formed by OCs less than 0.1 Gyr old, with only one eccentricOC in this respect. No probable system of older OCs has been found. Preliminaryestimations of the fraction of known OCs that form part of groups (9.4 to 15%)support the hypothesis that the Galaxy and the Large Magellanic Cloud aresimilar in this respect. The results indicate that OCs are born in groups likestars are born in OCs.

The list of possible double and multiple open clusters between galactic longitudes 240 and 270 degrees