Briarwoods

The Briarwoods are a noble human family, they are responsible for the deaths of Percy's family members, the De Rolo's.

Background
The Briarwoods were guests of the De Rolo household. During a feast that was held in their honor, the Briarwoods household suddenly and violently took control of the castle, killing or capturing anyone that opposed them. Percy was imprisoned beneath the Whitestone dungeons. He was later by his younger sister, and the two fled. The Briarwoods either were alerted during the escape or quickly found out, as their men chased them down. While Percy escaped, his sister was hit by several arrows and collapsed. It is still unknown whether she survived or not.

News From the North
During a meeting with the council, Percy discovered from Sovereign Uriel Tal'Dorei II that the Briarwoods recently visited Emon to open communications and establish an official trade route to the northeast. Seeming to be interested in dealing with Tal'Dorei politically, they have decided to join with Tal'Dorei, and expand its border to Whitestone. According to Uriel, the Briarwoods inherited the region from the De Rolo's, rebuilding Whitestone and honoring the De Rolo families deaths.

Based off of this information, it seems that the Briarwoods were able to fabricate some kind of story to convince everyone outside of Whitestone that they were not involved in the deaths of the De Rolo's.

Percy was able to convince the Sovereign that he was interested in meeting with the Briarwoods when they next visited, and would like to be notified in secret.

The Briarwood Family
So far, only two family members have been mentioned within the Critical Role storyline.
 * Lord Briarwood: Head of House Briarwood
 * Lady Briarwood: The Lady of House Briarwood