Solution

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To solve this problem, let's consider all the possible combinations of children:

1. Boy - Boy
2. Boy - Girl
3. Girl - Boy
4. Girl - Girl

Since we know that at least one child is a boy, we can eliminate option 4 (Girl - Girl). Now we're left with three possibilities:

1. Boy - Boy
2. Boy - Girl
3. Girl - Boy

Among these three possibilities, only one has both children being boys (Boy - Boy). Therefore, the probability that the other child is also a boy, given that at least one child is a boy, is 1/3.