Tyga and blac chyna

Tyga Worried About His
Son After Blac Chyna's
Arrest (REPORT)

Getty Images

Tyga posted the cutest.picture.ever of his three-year-old son King Cairo Stevenson.

But amid all the sweetness, the rapper and boyfriend of Kylie Jenner is apparently ultra concerned about the child's well-being after the arrest of his mom and Tyga's ex Blac Chyna, according to E! News.

RELATED: Kylie Jenner Confirms Once Again She Wants Kids

Though Tyga, 26, has been co-parenting his son with Chyna, 27, since they broke up in 2014, he has long been seeking full custody of the boy. And now, he's especially worried in light of Chyna's January 29 arrest on an airplane on charges of public intoxication and drug possession (police said they found ecstasy pills in her purse). Chyna has pleaded not guilty.

"He has already started the process to request for full custody," a source told E! News. "Tyga was wanting to file prior to all of this. The arrest was the icing on the cake, though, for him."

Another source said that Tyga is looking for legal advice on how to get what he wants.

"He is not into all this drama, but when it has to do with his child's welfare, he has a huge problem," the insider said.

Here's hoping that King Cairo stays safe and happy and his parents work out a deal that truly is best for him.