The son of “Good Times” star John Amos is behind bars for allegedly sending threatening texts — including images of guns — to John’s daughter … the latest chapter in a family war over the actor’s health.

According to the docs, obtained by TMZ, John’s son, K.C., was busted last weekend after his sister, Shannon, claimed he sent her a slew of concerning texts, which she says made her fear for her life.

Shannon told West Orange, NJ police her brother texted about his supposed gang affiliations, showing a handgun and a rifle. She claims he also sent her videos of him firing a handgun in an open field, and wrote, “Gonna sleep much better tonight big sis.”

According to Robert Florida, a spokesperson for the Essex County Prosecutor’s Office … Shannon said K.C. suffers from bipolar disorder, which has led him to believe she hired someone to kill him — and now she’s worried he might retaliate.

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As we reported, Shannon started a GoFundMe last month for her father John, claiming he’s been the victim of elder abuse.

However, John told us his daughter’s lying, and he’s not sure why she started the fundraiser. GoFundMe scrubbed the page after the “Roots” actor declined the cash.

After that mess, Shannon said K.C. no longer has authority to make medical decisions for John — and she’s sent him a cease and desist letter regarding online comments he’s made about her.

And FYI, K.C.’s been posting cryptic messages on his socials for a while — one on his TikTok less than a week ago says, “Imagine calling the police #Swatting your own brother 24 times over the last 15 years & not one arrest.”