In order to succeed in a personal injury lawsuit, the wife would need to prove that her husband was negligent in causing the accident. This means that she would need to show that he failed to exercise reasonable care in operating the motorcycle, and that this failure to exercise reasonable care caused her injuries.
For example, the wife might be able to prove that her husband was negligent if he was speeding, if he was driving under the influence of alcohol, or if he failed to properly maintain the motorcycle. If the wife is able to prove that her husband was negligent, she may be able to recover damages for her injuries, including medical expenses, lost wages, and pain and suffering.
It is important to note that there may be some exceptions to the general rule that spouses can sue each other for personal injuries. For example, some states have laws that prohibit spouses from suing each other for injuries sustained in car accidents. It is important to consult with an attorney to determine whether there are any exceptions to the general rule that spouses can sue each other for personal injuries in your jurisdiction.