My specialty for many years was Divorce Tax Planning and Litigation Consulting.
Most bizarre case (not one I worked on though) was a Dr. who hired a surrogate mother to bear his child. After artificial insemination she had triplets, decided to keep the three children and sued him for child support and won.
In my current work I quite frequently find where the husband is not the father of one or more of the children and doesn’t know it. It is more frequent than I ever imagined. Now, most of the time the husband does not know of the abortion. That is very frequent.