No. you do not need separate EP documents in each state. Well designed California EP is needed.

Better practice is to use form FL-145 to get basic information from your spouse about issues in your divorce.

Your California attorney may file petition to probate father's estate in California.

Your attorney may file petition for custody and visitation on your behalf.

Right to your ashes goes to the surviving spouse or domestic partner. If there's no spouse or partner, it goes to the surviving children.

Mother needs immediate consultation with probate counsel. Bring all documents to consultation.

Daughter my have rights as omitted heir. Review facts with probate counsel.

Notarization not necessary for will validity. SOL is 3 years. Consult probate counsel immediately.

Hire an attorney to do discovery, including securing birth certificates. You need attorney assistance.

Yes. Judge has power to deny MSJ simply by reading it and deciding.