My husband father is my in law. Does that mean he's my dad but I'm not related to him? Being that I lost to my parents and it's just me and my brother if something ever happen to me do I call my in law meaning if my husband's not around? Who will make a emergency choice regarding my health, my father in law or my biological brother I'm real close too?

I'm just confused.

I will assume English is not your first language, but I think I understand

I do not know what country you live, and the laws of that country.

In the US, you can pick anyone you want, most people, pick their husband or wife, but it can be anyone you trust, to do, what you desire.

Your father in law, has no obligation to take care of you, should something happen to his son (your husband).

It is up to your husband and yourself, to prepare for such emergencies.

If you are in North America, most couples have a Will, and insurance, and power of attorney should one or the other need to make medical decisions in an emergency.

I am assuming you are struggling with this, so why not talk to your husband, and the two of you should come up with answers that will set your mind at ease.

Put a card in your purse that says
EMERGENCY CONTACTS
Husband ----------
Brother --------
Father in law ----------

As long as your husband is alive, he makes medical decisions if needed. You don't need any legal documents. But many people like to fill out an Advance Directive, which is a medical form given to your doctor and hospital and loved ones, that sets out in legal terms what you want done as far as life support and other drastic measures to keep you alive. Your state website should have a blank one to print out.

(I am very sorry for the loss of your mother recently, and your father years ago, and the news that he wasn't your biological father. Many people find out that the parent they are looking for was a very undesirable person to the other parent, a criminal, or addict, or already married, and they find out that there is no wish for contact. I hope you can come to terms with that, and just continue to grieve for your mother. Plant a little tree for her, or build a shrine on a shelf, or start writing the story of her life, or just make a scrapbook of pictures and mementos, anything that provides a 'thing' or place for you to connect with her in a good way. As I've said here many times, I wear my dad's slippers, even though they are much too big and all worn out and held together with Gorilla tape.)