Nick Jonas says his future in-law Sophie Turner is "like a sister" to him already.
"I'm very excited," he said of the couple's upcoming wedding. "I think Sophie is an incredible addition to our family. She's like a sister to me already."
Nick said Turner, who plays Sansa Stark on "Game of Thrones," keeps a tight lid on the show's plot despite their close relationship.
"She's very good about her confidentiality agreement," he said.
Nick previously told People his brother's relationship with Turner seemed "meant to be."
"I am very close with Joe," the star said. "It was pretty clear to me early on that this relationship was one that was sort of meant to be, in a sense."
Joe and Turner got engaged in October after nearly a year of dating. The actress said in the May issue of Marie Claire that it's "lovely" to have found her person.