Parent visit invitation letter

We plan to invite my wife's parents to visit. I'm working and wife's still in school. Is it better to write the invitation letter in my name or in her name? Since the I-134 Affidavit of support is filled by me, does it make sense to have the letter written from my perspective? The plan is to write the Chinse letter addressing her parents (that one can be written by my wife), and write the English letter addressing the Consulate General.

I don't know if this is critical but I've heard various things. Please let me know if you have any comment or suggestions. Thanks a bunch.