Robert Pattinson has been openly dating Tahliah Barnett AKA FKA Twigs, and now a source has revealed that the "Rover" star's family approves of the relationship because his new girlfriend "brings out the best" in him.

An insider shared to Hollywood Life that Robert Pattinson's family "adores" girlfriend Tahliah Barnett AKA FKA Twigs, particularly his sisters who "have never seen him happier."

"Both Lizzy and Victoria totally approve of FKA twigs because they know how dedicated and committed she is to their brother," the source explained about the movie star's sisters.

The source added that Robert Pattinson's sisters "love how easy going (FKA Twigs) is."

"She really brings out the best in Rob - he's never been so at peace and just blissful," the source claimed.

The Hollywood Life report also explained why his family is not worried about the rumors that FKA Twigs is only using the news coverage on dating Robert Pattinson for the English singer to gain popularity. The insider explained: "They feel like FKA twigs has pure intentions and that her affection for Rob comes from the heart. They don't have any fears of her using Rob because of his fame or anything like that."

"They are all just delighted that Rob had brought FKA twigs home for the holidays," the insider added.

The source also pointed out the difference between how Robert Pattinson's family likes him dating Tahliah Barnett AKA FKA Twigs, compared to when he was still with his ex-girlfriend, Kristen Stewart.

"They've never seen him more in love, not even with Kristen," the source said, adding that "Lizzy has a strong connection with FKA twigs because they're both singers."

The insider explained: "What's impressive to Rob's sisters is that FKA twigs is interested in them and getting to know them. She's very engaging with them and Rob's parents, whereas Kristen was more reserved and closed off."