Notice to quit tenancy by tenant

We have a long term tenant (15 years) who informed us she is moving out to live with her boyfriend. However she has two children (who are now adults (18 & 24)) living with her. Our tenant asked us if we would transfer the tenancy to her children of which we have declined as neither of them have ever been added to the tenancy.

The reason is that one of us has staff accommodation that comes with the job and we have been advised that this is being revoked and we have to move out, we will become homeless and we will have to sell our property.

Does anyone know where we stand legally?? any advice would be appreciated.

You can decline to transfer the tenancy to the children. If the tenants serve a valid notice, the children must leave too. If they remain they will be trespassers. I think that as they have never been tenants you may be able to evict them without a court order, but you should check that with a specialist housing solicitor such as Anthony Gold or JMW.