My wife is an attorney who does some of this work, and she usually works in conjunction with a very well-known malpractice lawyer. The bottom line is the 60% you wind up with from a great attorney will usually be A LOT MORE than the 66% that you would get from an ambulance chaser.
You should ask the attorney to give full details of cases he has handled that are similar to your's, including the settlements. If he is an accomplished lawyer, he should have no problem with this.
You, your wife and your son are in my prayers.
God Bless
Thanks