That was exactly what I was thinking also.
There are other reasons why a student might be legacy at more than 2 universities. Some universities consider you legacy if a parent got a master’s degree or some other graduate degree at the school. Thus if you have only two parents, but each got a bachelor’s degree and each got a master’s degree, and if the four degrees were from four different schools, in some cases you could have legacy status at all four schools.
None of this tells you whether or not any of the schools where you are legacy would actually be a good fit for you, and for what you want in a university, and for what you want to study.