My husband's sister's (my SIL) marriage suddenly went downhill fast, and it has reached a point where her husband (my BIL) will move out on Jan. 1. They have 2 young children, unexpectedly caught in the middle of this.

They live in Middle America and practice Evangelical Christianity. In fact, that's ironically the source of the divorce, because my SIL is the breadwinner in addition to the household CEO, and BIL works some shifts at a hardware store. SIL is smart, has a master's degree, and is an overall strong woman. But, in BIL's failures to be the man at the head of the household (because Jesus), that has ostensibly gotten them to this point. BIL is pretty immature, only a high school education. He spends quite a lot of time hunting and fishing, at the expense of his family at home. (They do go together sometimes.) SIL has gun(s?) of her own, but he has many, like all kinds for all things. I actually don't think SIL had gun before she met him...nor did she have much Evangelical Christianity before meeting him either.

My opinion of the guy has always been that he's a very nice, but fairly dumb guy, someone who's a proud redneck. Big ole Trump-lovin, immigrant-hatin type of guy. And we've always gotten along just fine, but he's definitely thinking about my husband and me as libtard SJWs.

I've always wondered if there was more—politically—going on, as in is he a white supremacist? I can't say I have proof that he is, but I feel like it's probably hiding in plain sight somehow. He shaved his head a while back, he wears shirts with bald eagles and waving flags, and when I zoomed in on a recent picture—the kind taken by a rollercoaster at a thrilling moment— I noticed him holding up the "OK" sign, but we were on a coaster, and I'm not 100% sure about it.

The way things are going with them seems to be getting worse day after day. And I have no reason to believe there's any sort of domestic violence. My SIL would definitely stand up to that. And so while I know there's yelling and crying and just overall passion, I do not think he's prone to hurt her.

But I just keep thinking of those guns, there are probably a few dozen of them. It has always made me sick, all those guns there, but now there are guns AND divorce-emotions AND scared children in that house, and to me it's just more opportunity for some horrible accident, and I'm really just concerned about the children.

I live several states away, these are my in-laws, and I have no actual reason to believe anyone's being harmed physically, but I'm just concerned and feel a little helpless. Any advice?