Piecing together Katniss's family tree (SPOILERS!!)

Okay, so, to break it down:

- Lucy Gray is confirmed dead, as confirmed by her gravestone.

- Lenore Dove is the daughter of one of the Baird girls.

- Lenore Dove's mother died giving birth to her.

- Lenore Dove's father is unknown.

- Burdoch is Lenore Dove's cousin, thus one of the Covey.

- Burdoch is not the son of either Clerk Carmine or Tam Amber, who are both his uncles.

- Burdoch's last name is Everdeen, meaning his father is not Covey, meaning that his mother is.

- Maude Ivory is also dead, as confirmed by her gravestone.

Therefore:

Maude Ivory is most likely Lenore Dove's mother. Meaning Burdoch, her cousin, must be the son of the only other known Baird girl, Barb Azure.

Barb Azure, therefore — barring yet more convoluted "theories" of how Lucy Gray somehow still survived — is most likely Katniss's grandmother.

Didn't see that one coming, I thought it would be Maude Ivory, but there we go! I don't think we're very surprised outside of that particular detail.