The Gentle Intruder.

Mary Miles Minter is Sylvia, the niece of a man who leaves her a fortune. The money is in the hands of his lawyer, Baxter, who uses it to support his ambitious wife and daughter. Sylvia comes to Baxter's home and it's obvious she's not wanted there. Arnold, Baxter's son, is wasting his life away with drinking and nightclubbing, but Sylvia sweetly influences him to straighten up.