Custody drama has been plaguing Jenelle Evans for most of her life as a mother — and a new report claims the pregnant Teen Mom 2 star is now gunning for sole custody of her two-year-old son, Kaiser, from her relationship with Nathan Griffith.

According to court documents obtained by Radar Online, Jenelle doesn't believe her ex is cut out to parent their young boy.

MORE: Did Jenelle Evans Smoke Marijuana While Pregnant?

The mother-of-two's attorney writes in said documents that Nathan is not mentally stable and may be using drugs. The paperwork also reads that the troubled father plans to leave the country in addition to dealing with pending criminal charges.

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Jenelle and Nathan will face off in court on Jan. 4, 2017.

The formerly engaged couple split last spring for good and have been fighting over Kaiser ever since. From finances to visitation, it seems like few things have gone smoothly when it comes to this situation.

These latest court docs also claim that Nathan "does not regularly exercise his visitation with the minor child.”

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Jenelle is also the mother of a seven-year-old son, Jace, from her relationship with Andrew Lewis. Her mother, Barbara Evans, currently has custody over him.

MORE: Jenelle Evans Says She Wishes She Wasn't Pregnant — Find Out Why

It was revealed this summer that the reality star is expecting her third child, a baby girl she will call Ensley, in January. This will be her first child with her current boyfriend, David Eason.

See more photos of the Teen Mom stars with their kids in the gallery!