No. Only licensed attorney entitled to exercise privilege.

Do not ignore notice. You may be defaulted if you do not respond. Your attorney should carefully review case and all facts to best advise optons.

Contact APS...................................

Court not automatically notified of settlement. Either part may file notice of settlement.

Yes. OP may oppose order to ADR. Impossible to opine what judge will do.

Yes. Either you or management company may notify tenants of change. Best practice is for your attorney to do this to ensure it is done properly.

Yes. refer to: California Rules of Court Rule 3.1700. Prejudgment costs.

Yes. Active related small claims action supports filing lis pendens.

Consider petitioning for appointment as general conservator of person and estate. Read link before...

Consult NK counsel to avoid liability.