Indo18: Menantu Menghamili Tante Uno Kanaya -

or, if you just want to convey the fact without the sexual implication:

In early 2018 a story broke out in Indonesian media that captured the nation’s attention: a man identified as the menantu (son‑in‑law) of a well‑known family allegedly impregnated his tante (aunt) — his mother‑in‑law’s sister. The couple at the centre of the controversy was , a local businessman from Central Java, and Siti Nurhaliza (name changed for privacy), a 48‑year‑old aunt to Kanaya’s wife. Menantu Menghamili Tante Uno Kanaya - INDO18