Beraten lassen sich die meisten vor allem durch die Familie.
why "beraten" come at the beginning?
Usually the infinitive goes to the end of the sentence and you might have learned that the infinitive can only be at the end. Yet it still happens that many people put it at the beginning to shift the emphasis. Its a topic thats a little bit controversal if the infinitive has to be at the end or not. Even when the grammar says it has to be at the end, people just do not always place it at the end (and some people consider it a mistake, while others dont). Older texts have this more often than new texts.
So your sentence puts the emphasis on Beraten. Usually you would see/hear Die Meisten lassen sich vor allem durch die Familie beraten.