
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
The age difference between two siblings is three years. One year ago, their father's age was double the sum of the siblings' ages, and in twenty years, the father's age will be the sum of the ages of these two children. What is the age of each sibling?

Present the answer in LaTex format: \boxed{Your answer}
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