Up until recently, Miley Cyrus “had no idea” about the wrecking ball effect her mother’s recent marriage to her younger sister’s ex-lover had on the once tight-knit clan.

In August, Tish Cyrus, 56, married 54-year-old actor Dominic Purcell, who reportedly previously dated her 24-year-old daughter Noah Cyrus.

“Noah and Dominic were seeing each other in a friends with benefits way, off and on,” an unidentified source told People.