Bicycle Severe Disabilities Should My Dad Sue The Other Party Of An Accident In Which He Was Severly Hurt?

Should my dad sue the other party of an accident in which he was severly hurt? - bicycle severe disabilities

My father was hit by a truck while driving on a bicycle. He lay in a coma for more than a month, doctors say he has severe brain damage. I was just in the police report clearly states that the pipe is to blame. What can we do to help my father? Any help is appreciated, thank you