My son is going into Year 2 of uni and has found a student flatshare in London with 4 friends. I will be paying his rent and will be his guarantor for this and any further liabilities. It is a "joint and several" liability tenancy agreement which means that all tenants/guarantors are collectively responsible e.g. if one or more tenants doesn't pay their share of the rent or causes any major damage. I understand this type of tenancy agreement is very common these days, but it worries me. Aibu?