What is the name of the person Bob meets in the barn?  Answer the above question based on the context below:  The O'Leary family are traveling to Chicago to start a new life when Patrick O'Leary tries to race a steam train in his wagon. He is killed when his horses bolt. His wife Molly and their three boys are left to survive on their own. In town she agrees to prove her skills as a laundress when a woman's dress is accidentally spattered with mud. She quickly proves herself and builds up a laundry business in an area known as "the Patch". Her sons are educated. One, Jack, becomes a reforming lawyer, but another, Dion, is involved in gambling. While washing a sheet, Mrs O'Leary discovers a drawing, apparently created by Gil Warren, a devious local businessman. Her sons realize that it reveals that he has a plan to run a tramline along a street that he and his cronies intend to buy up cheaply. Dion becomes enamored with a feisty saloon-bar singer, Belle, who works for Warren. After a stormy courtship they become lovers. Meanwhile, Bob, the youngest O'Leary son, who helps his mother, is in love with Gretchen, an innocent German girl. They meet in the barn watched by the O'Leary's cow Daisy and plan to marry. Mrs O'Leary approves of the match, but expresses disdain for the loose-living Belle. Dion and Belle bribe the local politicians to set up a saloon on the street where the tramline will pass. Dion makes a deal to support Warren's political career and carve up business in the town. However, Dion's dishonest practices lead to conflict with his brother Jack when one of Dion's cronies is arrested for multiple voting. Dion later decides to support his brother rather than Warren in the election, convinced he can cut out Warren altogether and reign-in Jack's reformist zeal. He is increasingly attracted by the daughter of the corrupt local senator, leading to conflicts with Belle. Bob and Gretchen marry and have a baby.
The answer to this question is:
Gretchen