Definition: In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.
Input: Context: Roycroft was born in 1946 as the second of three sons to Bill Roycroft, an Olympic equestrian gold medallist Link Information: After the war, they moved with their son Barry (born 1944) to a 200 ha soldier's block near Camperdown in western Victoria, where they set up a dairy farm. The couple had two further sons, Wayne (born 1946) and Clarke (born 1950). Answer: Barry
Output:
What are the names of the equestrian gold medallist's other sons?