How much do auto insurance companys pay for neck and back injuries in an rear end accident?

Couple weeks ago me and my family was sitting at an stop light and this lady ran right into the back of us.I was the back seat panger so i felt all the inpack and i didnt have my sit belt on (im over 18) so my head hit the sit really hard(head aches now) and bad neck pain which is whiplish....My mom hit her head also on the sit belt holder u no above ur head....my dad was fine he was the driver...my dad got an lawyer to handle our case she has been sendin us to an Chiropractic and also she wants us to see another doc for pain meds.....we went str8 to the er in the ambulance....I no our med bills are gone be super high....whats an estimated price for all this....or how much you think it would be if we just settled....