God knows what your family is going through, He knows your brother's condition, He knows everything.

You said, - God said in Isaiah 40:10
You are terrified and scared - So do not fear, for I am with you;

Your brother is very sick and you witnessed a horrible event in the hospital.
- do not be dismayed, for I am your God.
You are not strong - I will strengthen you and help you;
You can't handle this on your own - I will uphold you with my righteous right
hand.

God heard your prayers. He hears even the unspoken and most silent prayers. He cares for you, your brother, your mom and everything that concerns you. He loves you and the people you love. His love is so great. Trust Him, He is our sovereign, all-knowing, all-powerful God. He is the king of kings and the Lord of Lords, He is our savior, provider, healer, father, and friend. Open your heart to God. Accept Jesus as your Lord and savior. With Him, you can face anything.

Here are two more verses for you from the Holy Bible.
"The Lord is good, a refuge in times of trouble. He cares for those who trust Him."
-Nahum 1:7
"In this world, you'll have trouble. But take heart! I have overcome the world."
-John 16:33

I'll continue to pray for your family. Have faith in God. May God bless you.