Threat

[OopsIdidittentimes]

My Sil is in a relationship with someone that has caused some rifts in our family for many reasons, recently her partner has threatened my MIL and said he will burn her house down if SIL leaves him.

I am unhappy to let my children stay with MIl until something is sorted out but OH says its OK as sister hasn't left him? I (they live round the corner from MIL).

Mil is now very upset and says it would never happen and its all just talk, she is really angry with us for suggesting the kids may be in danger.
I think the threat is enough to keep them away, what kind of person threatens to burn someones house while they are in it?

AIBU?

Police?

Absolutely keep them away.
I worked with a lady who survived, along with her 3 children, with only the clothes they were wearing, when her daughter's ex boyfriend set her house on fire as revenge for the daughter finishing with him.
She had no insurance. If she hadn't woken up they would all have died.

Police. definitely. And keep your kids clear UNTIL your sister has cut this man out of her life and got through the aftermath. Invite your mum to see kids at yours though

Is risking the life of your children worth keeping her happy? Maybe this is the wake up call she needs to realise something is very wrong, I can only assume that is not a healthy relationship

Good God i certainly dont blame you for not allowing to stay there.
. It makes me shudder to say this but sometimes these are promises rather than threats.
Please report this.

Your MIL needs to inform the police about the threat. Encourage her to do that and take it from there.

You are not being unreasonable to worry about the safety of your children and keeping them away from there for now, but I assume MIL can visit your house and perhaps babysit them there if appropriate?

Seriously? Can't imagine not reporting this threat to the police. Can't imagine letting my kids near the place.

Yanbu, your MIL and OH are being naive. Men act out on these type of threats all the time.

Police