The altarpiece is The Holy Family, by Niccolò Circignani. The text reads “He was obedient to them”. Of the four tombs against the walls, three are of male members of the Cerri family, including Cardinal Carlo Cerri. The fourth is a female member of the Martinelli family. There is a basin between the inner and outer balustrade, which indicates that this chapel is probably used for baptisms. There is also an urn under the altar.

(Another photo of the altarpiece here)