Bluey related music question

My family all love Bluey. But when they yell out the names of the family members during the theme song, it’s incredibly hard to time it so that you yell at the exact same time. (Try it if you don’t believe me.) Why???

i can do it just because I’ve watched so much, but if I try I still can’t count out that theme and then rest for the right amount of beats, particularly before they yell, “Dad.” I can’t find theme music online with lyrics so I can’t see the notes. Can someone help explain this please!