Do you add no on the end to specify sister or are there separate words if you want to specify?
There are different words for brother and sister, and even those are divided into older and younger.
Younger sister = húg Older sister = növér Younger brother = öcs Older brother = báty
This sentence should translate as sibling, so just report it.
And if you want to divide them just by gender, you can say fiútestvér or fivér for "brother", and lánytestvér for "sister".