Does anyone recall that incident with the brother and sister who were seen laughing and giggling in an awkward manner just hours/days after their family member was killed?

https://youtu.be/lnIPnfxUA10?si=QxA_7BoWNNxi-kzN

When the whole ISIS situation was going on, there was a journalist who was killed.

The family was in a fake and many aspects did not add up.
Both of them could not stop giggling and smiling throughout the interview.
It's surprising how quickly this incident was forgotten, with barely anyone showing interest.

I'm not denying that ISIS has killed people; I'm only questioning these interviews with supposed "family" members.