Not likely, in Spanish "son" is a conjugated verb and means "they are." It can also mean "rythm" or "music" in some countries.
Richardson
Step son?
Your daughter's son's son is your great grandson.Your daughter and your sister's son are first cousins.Your great grandson and your sister's son are first cousins, twice removed.Your great grandson...
He would be your great nephew
Your sister's son is her grandson and your great nephew. Some use the term "grand nephew."