"He is at his daughter's place."
Translation:Il est chez sa fille.
I guess you understood that Il est = He is. The preposition chez is typically French. It is followed by a noun referring to a person and means at this person's place. For instance chez moi = at my place, chez Obama = at Obama's place, chez mon ami = at my friend's place, chez le boucher = at the butcher's...