我娘她女儿可美了我爹他儿子可帅了
[wŏ niáng tā nǚ ér kĕ mĕi le wŏ diē tā ér zi kĕ shuài le]
'My mother's daughter is very beautiful, my father's son is very handsome.' The user name is a lighthearted way to say that their siblings (a sister and a brother) are good-looking.