This is an interesting picture - a combined family picture of the Riggs Family parents and Lintz Family parents with (some) of their children who have acted together on The Walking Dead.
The woman in the flower dress is the mom of the Riggs family. The woman in the green shirt is the mom of the Lintz family. The older man in the blue shirt is the dad of the Riggs family. The older man in the orange ball cap is the dad of the Lintz family. The young man with the red, white, and blue shirt is Matt Lintz (22 years old). The young man in the black leather jacket is Chandler Riggs (23 years old), and the young man in the back row with the white shirt on is Macsen Lintz (18 years old). Missing from the picture is Matt and Macsen's sister older Sophia, who also played on The Walking Dead. (They have another older sister named Kenzie who did not play in The Walking Dead.) Chandler Riggs' younger brother Grayson (20 years old) was an extra in the show very briefly, but would not really qualify as an actor for the show for a picture such as this. (Important Note: Google is incorrect about Macsen's age. It has him born in 2006 and 17 years of age. Other sources such as famousbirthdays have him born in 2005 and currently 18 years of age. The latter is correct.
His mother's Instagram has a post wishing him a happy 18th birthday, and she's a better authority on that than any website!)
It's great that their families keep up, and their young adult men are extremely cute/hot!