While very worthwhile and commendable, IMO, this would never ever be service credit. What technical assistance or financial education would you be providing by purchasing items for a LMI family? This may be a CD investment/donation, but as Don inferred, ONLY if the funds are being provided by the bank, not individual employees. If "your group" adopts a family and everyone personally donates, even though your contribution may be in the name of ABC Dept at XYZ Bank, you can not present that for consideration because the bank did not make the donation - the employees did.
And while I agree that you should present the "maybe" or borderline services and donations to the examiners for consideration, submitting activities and donations that clearly do not qualify will leave your examiners with an impression that the bank does not fully understand the regulation.