Your attorney is in the best position to answer this question. Everything is taking longer these days.

It is very likely you both will inherit, especially if you were raised by him.

It appears you may lack the knowledge to form a question that can be reasonably answered. If you submitted a Request for Default that was rejected...

Sure if he gets to cooperation of the family member.

Sure, hear him out. You might be able to make progress with just the 2 of you. Just listen more than you talk.

Yes their objections are waived. Do a meet and confer letter advising the objections are deemed waived and ask them to to respond to any question...

File a small claims complaint they may just give you your $280

A lot to unpack here. To much to resolve on the internet. Reach out to an attorney. Discuss whether there was a will or trust.

It sounds like you were co-agents, so you would both be responsible, especially if you signed the checks as well.

No one can answer that question as we don't know anything about your case, what the trial is for, and what the issues are. It is possible after...