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Young planets provide a window into the early stages and evolution ofplanetary systems. Ideal planets for such research are in coeval associations,where the parent population can precisely determine their ages. We describe ayoung association (MELANGE-3) in the Kepler field, which harbors two transitingplanetary systems (Kepler-1928 and Kepler-970). We identify MELANGE-3 bysearching for kinematic and spatial overdensities around Kepler planet hostswith high levels of lithium. To determine the age and membership of MELANGE-3,we combine new high-resolution spectra with archival light curves, velocities,and astrometry of stars near Kepler-1928 spatially and kinematically. We usethe resulting rotation sequence, lithium levels, and color-magnitude diagram ofcandidate members to confirm the presence of a coeval $105\pm$10 Myrpopulation. MELANGE-3 may be part of the recently identified Theia 316 stream.For the two exoplanet systems, we revise the stellar and planetary parameters,taking into account the newly-determined age. Fitting the 4.5 yr Kepler lightcurves, we find that Kepler-1928 b is a $2.0\pm0.1R_\oplus$ planet on a19.58-day orbit, while Kepler-970 b is a $2.8\pm0.2R_\oplus$ planet on a16.73-day orbit. Kepler-1928 was previously flagged as an eclipsing binary,which we rule out using radial velocities from APOGEE and statisticallyvalidate the signal as planetary in origin. Given its overlap with the Keplerfield, MELANGE-3 is valuable for studies of spot evolution on year timescales,and both planets contribute to the growing work on transiting planets in youngstellar associations.

Transit Hunt for Young and Maturing Exoplanets (THYME) VIII: a Pleiades-age association harboring two transiting planetary systems from Kepler