The Neighborhood (1981)

Original title: El vecindario

Mexican comedian Alfonso Zayas is just one of the many folks in town who are cheating on their spouses, imagining themselves quite clever and secretive, even while unbeknownst to them their spouses are cheating on them in turn! When one of the many women with whom Zayas has a child dies tragically, he attempts to integrate his daughter into one of his other families, calling her his goddaughter. But when his son falls in love with her, the many sexual escapades around town threaten to take a disturbing turn for the worse.