If a slave steals from the property of his master’s father, is his hand cut off?

The questioner : If a slave steals from the property of his master’s father, is his hand cut off...?

The Shaykh : Yes, his hand is cut off.

The questioner : Well, how did you say it? If a slave steals... because his master...

The Shaykh : Yes, because the master has a right in that specific property. Yes.

The questioner : Okay...

The Shaykh : As for the grandfather, he has no right except ownership, and he is not a partner. The grandfather is not a partner in his son’s property, but he has the right to take ownership only.
...and what does that mean, Yasser?