My question involves court procedures for the state of: CA
I am preparing for an appeal. After doing some research about rules of evidence, I have learned that: "Federal Rule of Evidence 402 states, in part, "All relevant evidence is admissible, except as otherwise provided."" In addition to that, I have learned that: when a party makes an objection regarding the admissibility of the evidence being offered by the other party, the judge should sustain or overrule the objection.
Here is the situation: In a Family Law case, both parties appeared pro se. During the hearing, the plaintiff presented one (and only) evidence for the court. It is in an audio recording in different language and no translator was present at the time. The defendant made an objection about the sufficiency of the evidence being offered. The judge stated he does not understand the language but gave the plaintiff an opportunity to present the evidence if he wants to. During the defendant's turn, the defendant offered to present his last evidence: a similar relevant recording which is also in a different language (same language as the plaintiff's evidence). The plaintiff did not make any objections. But because the evidence is also in a different language , the judge informally refused to hear the evidence. By the end of hearing, the judge ruled to the plaintiff's favor.
To my understanding, (1) the judge's refusal to hear the relevant evidence offered when there is no objection is a violation of the rules. I also think that (2) the court erred in admitting an evidence in a language that the judge does not understand. And lastly, I think (3) the court erred by not giving a fair trial by allowing one party to present an evidence in a different language and refusing to hear the other party's similar evidence.
Please help me find concrete information (case laws, statutes, rules) that I can cite to support my appeal. I would appreciate any input. Thank you.

