They have same pronounciation in Chinese, "shéi" or "shui". (谁） They are different when you use them. In Chinese, “谁" is sometimes used as a accusative word, it can be also used as a subject. For example, 那个男孩是谁？(accusative) Who is that boy? 谁给你的那本书？(subject) Who gave you the book? It may different in English. Another example, The answer depends on whom you ask. (答案取决于你所提问的对象。) Who are you talking to? （你在跟谁说话？）

Because of the grammatic difference, there's no usage such as 'whom' in the sentence structure in Chinese. For example, if you translated 'To whom are you referring?' and 'Who is that lady over there?' into Chinese, it would be '你指的是誰？' and '那邊的女士是誰？', Both are '誰' and pronounced the same 'shéi'. I hope this answered your question.

both are“谁”, pinyin is shui or shei “谁的”means “whose”

They are same in Chinese"谁”。

Whom/Who do you like? <<< Although it's sounded a little odd and outdated, grammatically equals to 'whom/who is she'. :p