Legal Question in Landlord & Tenant Law in Washington

It is unlikely that would be a basis for breaking the lease without consequence. The landlord only has a duty to provide "habitable" housing which, under State regulation, is already a substantial burder. He/she has no obligation to meet the specific medical needs of your family. However, likely if you talk to your landlord they'll be willing to make reasonable accomodation if they are in anyway human. That aside, finding an equally qualified tenant to take your place should suffice as the landlord would have a "duty to mitigate" his/her loss. This would include renting the place to another tenant during your lease period if one is available. If you've already found one for him the entire remainder of your tenancy might be mitigated. You'll probably have to pay incidental costs relating to moving one tenant out and a new one in.

At your service,