1. You should have caused searches in the court to find out about any litigation.
2.Anyway now the proeprty is entangled in litigation and there is no surety how soon it would be released.
3.Since I donot know much about the litigation about the brothers I can not comment on its merit or outcome.
4.Since you are a bona fide purchaser without notice you have your title protected in the proeprty.So enjoy it in the meantime.