How am I supposed to serve California requests for production of documents--on all appeared (and still undismissed) parties?

All discovery should be served on all parties.

My question is the question is my brother is been writing a check for my mum for a house payment my mum has a well it has said

He would be entitled to reimbursement through the probate. Has probate been started? If no, you will need to do so.

If you plan on keeping it or it has equity, yes. If you are going to let it go, no.

Are utility companies and hospitals considered creditors in probate?

Yes they are creditors of the estate.

I’m I forced to sell a property if I don’t agree with what I’m being offered?

List the property with a real estate agent and take the best highest offer.

Can I raise rent on house co-owned with 2 others who refuse to charge market rate rent?

Yes if you give proper notice you can raise the rent.

My mom passed away February 9 2017 my sister and brother is taking everything from my dad my dad have dimentra.

Call Adult Protective Services. Get an attorney and file a conservatorship. Do this ASAP because once it is gone it is harder to get back.

Can my sister sale the house if I am on the deed?

If you are on title, she cannot sell the house without your signature. That said, you cannot unreasonably withhold your signature. Note - have an...

Do you have to file a lawsuit at the same time you file an application for appointment of a guardian ad litem?

Why would you think you need a summons and complaint? Guardianship can be done by completing forms and there are handbooks to walk you through the...

No, a convicted felon would not qualify for a bond.