Identifying relationships
Xiaohong has 3 older sisters and 2 younger sisters. Xiaomei, one of the younger sisters, is also identified.
Counting older sisters
Xiaomei, being one of the younger sisters, has 3 older sisters plus Xiaohong, making a total of 4 older sisters.
Evaluating unique solution
I'm piecing together if the puzzle has a unique solution. Given the puzzle's constraints, it seems there are no additional siblings or constraints impacting the outcome.
Wrapping up the uniqueness
I'm concluding that the puzzle likely has a unique solution since no other arrangement would alter the number of older sisters Xiaomei has, based on the given constraints.
Confirming the count
Xiaomei has 4 older sisters, based on the given constraints and logical deduction. No other arrangement changes this count.
Reasoned for 41 seconds