8. Xiao Yu's family consists of Dad, Mom, Brother, Sister, and Xiao Yu, a total of five people. From the 1st to the 5th of this month, there are two household chores every day: one person cooks, and another person washes the dishes, and everyone has to cook once and wash the dishes once in these 5 days. One day they had the following conversation:
Brother: I just washed the dishes yesterday, and I have to cook tomorrow, so tiring!
Sister: I am even more tired, I have chores both tomorrow and the day after!
Xiao Yu: Dad and I always do chores on the same day.
Dad: Yes, fortunately, after cooking, I can rest for two days before it's my turn to wash the dishes again.
So the five-digit number formed by the dates when Dad, Mom, Brother, Sister, and Xiao Yu wash the dishes in sequence is $\qquad$
$54132$