'My brother is dating our new step-sister – he is crossing some serious lines'
!['My brother is dating our new step-sister – he is crossing some serious lines'](https://i2-prod.irishmirror.ie/incoming/article32954581.ece/ALTERNATES/s615/3_Thoughtful-man-trying-to-sleep-in-his-bed-at-night.jpg)
A man took to social media to seek advice after his brother started dating their new step-sister, with him admitting he hasn't spoken to him much at all after learning about the relationship