I am unable to understand you

In the previous chapter, we read that Kashif when found out that Sana had left because of her grandma, and the reason he started arguing with her was when Kamran got a call and excused himself. Let's start the chapter with the argument between Grandma and Kashif:

Grandma: Yes you are! But you don't have any right to her. And also our religion doesn't give you any rights by engagement and besides what about Kamran? I know he thinks of her as a sister and respects her but there are certain boundaries and rules.

Kashif: I am unable to understand you

Grandma: According to Islam you two are strangers to her. And also what will people say?

Kashif: Ok! But tell me one thing

Grandma: ok

Kashif: Is she more safe being alone in her house or being with us?

Grandma: I got your point that is why I am not upset with you. This will not happen again By the way whose idea was this to suggest that Sana should sleep here?

At that time Kamran return to the room, Kashif said: