Jenelle Evans of Teen Mom 2 fame may have just had her first baby with boyfriend Nathan Griffith, but it looks like her beau is going out of his way to be a father to MTV star's first child.

Baby Kaiser Turns 2 Months Old

Jace's birth father has never really been in the picture and Evan's abusive ex-husband Courtland Rogers was far from what she would consider a father figure. Griffith has a daughter from a previous relationship, along with newborn Kaiser, who Evans conceived in June. Nonetheless, Griffith has not hesitated to treat five-year-old Jace as if he were his own.

"Jace is having so much fun right now," tweeted Evans on Sunday when she shared a set of photographs showing Griffith teaching Jace how to hit a baseball. "have the entire field to ourselves now!" she boasted a little while later. "Nathan is teaching Jace the insides and outs of baseball."

In Evans' accompanying photograph, it seems as though the 23-year-old mother was spectating from behind the fence while the boys bonded out on the field.

Soon after, the family all headed out for dinner. "Thank god for Buffalo Wild Wings," tweeted Evans with a pic of Griffith and Jace playing some sort of game on a tablet. "Keeps them entertained!"

It sure was an exhausting weekend and Sunday night Griffith finished things off with snapping a pick of Jace and Kaiser sleeping side by side together. "Wow!!!" he wrote on Twitter "You can tell they are definitely brothers!"

While Evan's mother Barbara has legal custody of Jace for the time being. She and Griffith get married as planned, it is uncertain whether or not Griffith will look to adopt the boy.

Teen Mom 2 continues on MTV with new episodes Wednesdays at 10 p.m. ET/PT.

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Teen Mom 2, MTV, Reality TV