"Samwell, you have surprised us all at Horn Hill. Clearly the pen mightier than the sword. Btw where is 'Heartsbane'?" he tweeted.
In the show, the gruff Randyll despised his sweet-natured and bookish eldest son for being "soft", favoring his more like-minded second-born Dickon... so much so that he disinherited Sam by sending him to join the Night's Watch so his little brother would be the family heir.
The question was a valid one: in a recent episode, Samwell gifted Heartsbane — one of the very few remaining Valyrian steel swords remaining in Westeros — to his friend Jorah Mormont (similarly, Jorah's father and Night's Watch Lord Commander Jeor Mormont didn't pass Longclaw to his disgraced son, giving it instead to Jon Snow).
Jorah fell in the Battle Of Winterfell protecting Daenerys, and is seen being burned on a funeral pyre in the most recent episode — but the priceless sword is never mentioned.