It sounds like she is saying spielst. I know that's not correct, but it throws me off.
Is mit only a dative preposition, or is it two way?
@john_hempel : Only dative: http://german.about.com/library/blcase_dat2.htm
In English we would usually say "the son is playing with his grandfather" unless the latter is not the grandfather of the son (but of someone else).
Is that the same in German?
Curious about this same thing. Following!
Mit is dative. Für is accusative.
In the audio, it sounds like she is saying "spieltSCH'.