Multiple questions which will take too long to address in this forum. some observations follow. If brother did not have capacity at time he...

You need to hire counsel to petition to remove brother as co-trustee and recover damages. You have not cited facts which may be basis for criminal...

No. You are not entitled to settlement payable to deceased mother without authority. More case specific information needed to provide further...

Your "condensed version" is useless. Hire counsel and review non-"condensed" version for a "non-Condensed" evaluation if you are serious.

Your odds are poor. California courts disfavor default judgments and you have not sufficiently stated type of case involved.

Hire counsel to review facts and provide needed direction to you. Possible relief may include monetary damages, restraining order, injunction.

No. Discovery responses are not filed with court. Your son may obtain the discovery responses from his attorney and share them with you if he...

No. You may not66 file your own motion if you are represented by counsel. Filing pleadings is the job of your counsel.

You are in over your head. Personal appearance, rather than by phone may be helpful. Hire counsel to advocate for you.

Allan Armstrong is correct:. 1/2 to surviving spouse; 1/4 to you; 1/4 to niece You have cited correct probate code section.