To answer your question, I would have to know certain additional things. Did the landlord ever offer, or attempt to do anything to correct the mold issue other than replace the windows? How and when did you notify the landord about the return of the mold problem? Do you have any reports from Doctors or mold experts, who would say that the mold is the cause of your childrens' ailments? Generally, landlords do not like to fight about mold issues and will possibly not file suit for the last two...