Colour-magnitude diagrams of open cluster stars using Gaia DR3 photometry. The axes represent the Gaia (G_BP - G_RP) colour and absolute G magnitude. The blue dots represent high-probability members from Cantat-Gaudin et al. (2020), while the red crosses indicate the stars analysed in this work. The Theia 1214 stars are plotted alongside NGC 752 (indicated by the green crosses) due to their suggested association with NGC 752 (Dal Ponte et al. 2025).