Your situation is quite complicated, because it deals not only with the rights and remedies of landlords and tenants under the Residential Tenancies Act, but also with both the Ontario Human Rights Code and the Condominium Act. Where the rights of an individual unit owner within a condominium complex come up against the rights of the Condominium Board, it is generally advisable to hire legal counsel specializing in this area of law.
Your problem is not just about noise and damage being done or experienced in or on the property, but it may also leave the condominium corporation vulnerable to insurance claims or other legal liability because minors are being locked out of the building by the adults in your unit.
Due to your situation involving children, you must also consider the landlord's duty under the Human Rights Code to accommodate a tenant to the point of undue hardship. Therefore, the need to hire legal counsel specializing in these areas of law is even more urgent. The Landlord and Tenant Board is generally very reluctant to order eviction when children are involved, unless they are satisfied that the landlord did all they could to accommodate the tenant's situation.
An option that you can explore in the meantime is approaching the tenant about the possibility of termination of the tenancy by mutual consent by signing an N11 agreement to terminate: https://tribunalsontario.ca/ltb/forms/