Tenant sleeping in non-egress basement

[Kyle Hilliard]

Hey everyone, 

I just stopped by a SFH rental of ours and noticed that one of the tenant's sons is sleeping in the basement which doesn't have an egress window. The tenants are two sisters, each of whom has two children (so 6 people total in the house), and the house has 4 bedrooms. We only advertised the actual bedrooms as sleeping areas. What do you think I should do to resolve the problem?

Sorry if this question is redundant, I found a couple similar posts on the forum, but still was unsure what I should do. One post basically said that where the tenant sleeps is their business, and other posts said to make sure that nobody is sleeping in a windowless room for fire safety and liability reasons. 

We don't currently have the cash saved up to install an egress window in the basement. Other than this issue, the tenants have been wonderful so I'd like to resolve this as smoothly as possible for both sides. 

Thanks for your help!