Mrs. Triplett

Antoine Triplett's mother was introduced in the episdoe "Aftershock" of Agents of Shield, when Phil Coulson arrives at her door to inform her of the death of her son.

She has a hanging picture of the Howling Commando in her front room, which heavily implies that she is the daughter of one of them, as it was well known to Coulson's team that Triplett's grandfather was a member of the team.