In the family, there are a total of 12 siblings, with 4 of them being sisters. To find the number of brothers, we subtract the number of sisters from the total number of siblings:
\[ \text{Number of brothers} = \text{Total siblings} - \text{Number of sisters} = 12 - 4 = 8 \]
Now, we have 4 sisters and 8 brothers. The ratio of sisters to brothers can be expressed as:
\[ \text{Ratio of sisters to brothers} = \frac{\text{Number of sisters}}{\text{Number of brothers}} = \frac{4}{8} \]
This can be simplified:
\[ \frac{4}{8} = \frac{1}{2} \]
Therefore, the ratio of sisters to brothers is \( \mathbf{1:2} \).
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