Article continues below advertisementJenelle Evans' son Jace has been hospitalized in a mental health facility after allegedly pulling a gun on his grandmother, Barbara, before threatening to kill both her and himself.Sources with knowledge of the situation told TMZ the 16-year-old reportedly put the firearm to his head during the terrifying incident.Jace's horrifying outburst comes amid concerns about the teenager's suspected substance use, with insiders claiming the 16 and Pregnant star's son had been drinking and taking drugs prior to the life-threatening ordeal.