Sonny Boy (1929)

On the eve of her divorce, a mother enlists her sister's aid in smuggling her young son out of the house, fearing that she will lose custody of him and hides out in the apartment of her husband's bachelor lawyer, who has just left town for a month. Complications arise when the lawyer's parents unexpectedly pay him a visit, and the woman is forced to pose as his new wife in order to be able to stay hidden out in the apartment.