Rolling forward a bit, but still in regard to Jack and his rather complicated family dynamics, I want to take a moment to just clarify something in regard to AWE and the fact I have stated Jack’s mother died when he was young ( as has been canonically discussed as well ) and he distinctly asks Teague how’s mum? 

He’s referring not to his own mother, but rather Teague’s – in other words, Grandmama. Jack has absolutely no desire to associate himself to that woman more than he has to – and following his death, his need to distance himself from Teague is higher than usual, but he also knows it to be unwise not to acknowledge him in some way. 

The fact that he is presented with a shrunken head and does not even bat an eye as he follows up with She looks great stems from the fact that:

A) That might not be Grandmama’s head for all he knows. Teague is something of an expert at completely deflecting any situation with a distraction, and Jack’s learned long ago to not have any expectation that things are as they seem with him. 

B) If that is Grandmama – farewell and good riddance to bad rubbish, really.