Justin Bieber's dad Jeremy Tweeted this adorable pic of his two sons fast asleep in bed, at the family's Toronto home on Thursday.

But all is not well in Bieberland ... the pop star turned himself in to Toronto police Wednesday night on an arrest warrant stemming his alleged assault of a limo driving back in December. That charge, coupled with Biebs' recent DUI arrest in Miami, has Justin's attorneys working overtime and JB's dad taking to Twitter to defend his son.

The 39-year-old father-of-two captioned the pic, "Safe and sound #homesweethome." And Tweeted: "'Lovin on @JaxonBieber and @JazmynBieber. FAMILY."

Meanwhile, Justin had some words of his own, praising his dad's parenting skills, writing: "I have the greatest Dad in the world,. He's taught me how to love, learn, and stay true to myself. I will forever be grateful because he was my superehero #batman," along with a photo of his pop wearing a Batman beanie.

It's just a big lovefest up there north of the border! Still, we can't help but think there's a bit more trouble on the horizon as the pop star deals with all his legal troubles ...