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Given the closeness of the two open clusters Collinder 135 and UBC 7 on the sky, we investigated the possibility that the two clusters are physically related. We recovered the present-day stellar membership in these open clusters (300 pc from the Sun) to constrain their kinematic parameters, ages, and masses and to restore their primordial phase space configuration. We investigate the system of these two clusters and possibly coeval stars in 6D space with Gaia EDR3. The actual separation of thedoi:10.5281/zenodo.5547783 fatcat:5imuy77crfgihnkalnsbp6f6yq