Simplify the following text for a Grade 7 native English-speaking person.
Original: In 1933 , when Prohibition in the United States ended , Graham 's father forced Graham and his sister Katherine to drink beer until they vomited , which created an aversion , in both of them , to alcohol and drugs .
Simplified: In 1933 , Graham 's father forced Graham and his sister Catherine to drink beer until they vomited .