Madonna's behaviour he believes is a bad influence on David.
Yohane, who gave David up for adoption in 2006 when he was seven-months-old, told The Sun:
“Madonna and Guy’s custody battle turning bitter and nasty is a huge concern.
I’d like to know what’s going on behind closed doors and why Rocco wanted to leave his mum and live with his dad like that.
My children are all very close and have lots of fun together, which is how life should be for brothers and sisters."
Madonna and Guy Ritchie have been embroiled in a public battle over the custody of teenager Rocco for the last few months after the 15-year-old refused to return to his mum for Christmas.
And thats not all! As it seems it isn't just the Rocco situation that disturbs him. Madonna's behaviour he believes is a bad influence on David: "What I have heard about Madonna’s lifestyle since her divorce from Guy sounds quite shocking.
Her having much younger boyfriends isn’t in line with Malawian culture at all. David would not be exposed to that sort of thing here. It’s not how we live. We have strong family values."
Yohane admitted he was worried her behaviour would see Guy take custody of his son, something he insisted he doesn't want.
Meanwhile, a Judge has issued a sound warning to Madonna and ex, Guy Ritchie to settle their custody dispute over 15-year-old son Rocco or risk missing the last years of his childhood locked in a divisive legal battle.
Watch Madonna expose a fan's breast onstage.