Writing book need help with a logical car accident scene?

Question

ok, so I am writing a book. In the begining I want there to be a car accident. there are 3 people in the car. Father-driver, daughter 1-passanger, daughter 2-sitting behind daughter 1

So I want the father to die from the accident, and daughter 1 to lose her baby(she is pregnate). But I want daughter 1 and daugher 2 to only have minor injuries.

I need help ansering:

what caused the father and not the daughters to die, impact ect

how far pregnate daughter 1 is to resonably lose the baby

what are the daughters injurys

did father die at scene or at hospital afterward

what happend with person who hit them

I want it to be 4th of July at night and a drunk driver to hit them

Let me know if this is impossible and what I should change to make it possible

the daughters are twin 16 year olds,

Do they have an air bag?

What kind of car should they have?

Answer 1

probably an old car for dad to die.

or maybe he wasnt wearing his seatbelt

the drunk driver could hit them side-on, on dads side

daughter 2 will have whiplash

daughter 1 will have whiplash and cuts from broken windscreen

she will be about 4-7 months pregnant

her seatbelt was fitted incorrectly, and went across the baby, not under it

dad took the most force from the side on crash. major cuts to legs, arm and neck

severe blood loss. died in the ambulance