Hang out together should work too, no?
"The grandmother and her grandson play together" is not accepted. I thought it would be okay.
It is not necessary to say "her grandson" in Korean language
It might not be necessary, but that doesn't mean it's incorrect.
Simply report it so that it can be added! :)
Does this mean that your grandmother plays with your grandson? That means your grandmother must be about 120 years old but is it what the sentence is talking about?
No, that's not what it means. It means that a grandmother plays with her grandson.
Why not The grandmother plays with the grandson?
I wrote "A" instead of "the"> completely wrong, somehow. Really Duo, not you're trying to nitpick english?