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Near-Earth asteroids Ryugu and Bennu, were visited, characterised, andsampled by the Hayabusa2 and OSIRIS-REx missions: remote sensing data andsample return analysis showed that both asteroids have primitive, hydrated andorganic-rich compositions. The dark families of the inner main belt (IMB) thatbelong to the spectroscopic C-complex have been claimed to be the sources ofboth Ryugu and Bennu. Hence, there has been large effort to characterise them.Here we used the Gaia Data Release 3 (DR3) asteroid reflectance spectra toinvestigate the 11 known IMB C-complex families (Chaldaea, Chimaera, Clarissa,Erigone, Eulalia, Klio, Polana, Primordial, Sulamitis, Svea, Tamara). For eachfamily, we extracted the family members that have known geometric visiblealbedo values and Gaia DR3 data and we created an average reflectance spectrumper family between 370 and 950 nm. The average DR3 reflectance spectra of eachfamily were compared with the previous literature data and to Bennu's andRyugu's spectra. We found that DR3 reflectance spectra of the IMB C-complexfamilies are in general consistent with previous findings with the onlyexception of the Svea family. We also showed that the Polana and the Eulaliafamilies can be distinguished in the wavelength region 370 - 500 nm. Among allthe IMB C-complex families, we determined that the average reflectance spectraof the Eulalia and Polana families are the most similar to those of Bennu andRyugu, respectively. In particular, Eulalia family's average spectrum is a goodmatch to Bennu's in the wavelength range 450 - 800 nm, while beyond 800 nm thespectrum of Bennu is bluer than that of Eulalia. Moreover, the spectrum of thePolana family has the smallest discrepancy against the spectrum of Ryugu,although this match is formally unsatisfactory (reduced chi^2 ~ 1.9).

Gaia view of primitive inner-belt asteroid families: Searching for the origins of asteroids Bennu and Ryugu