The Trespasser (1930)

Melodramatic to the max... secretary marries a rich boy, whose father wants to have it immediately annulled under the pretense that this way they'll have the chance to do the whole courtship thing right. Pride prevents the woman from staying when the rich boy sees his dad’s point but, wouldn’tcha know it, he knocked her up during that one night of marriage.  When the boy's three or so, the woman's involved in a scandal when her married boss leaves a chunk of cash to her in his will.  She calls on her former husband and, once again, his father sees an angle to work.

The story is kind of convoluted and too messy to ever be neatened up in real life, but they manage it anyway.

C+