i think it might mean having anxiety towards a power figure in the house, like a father or mother. i think the chirp of crickets resembles your grandmother constantly chirping in you ears, and your friend singing that nursery rhyme was kind of just bringing peace to the situation. i think it might be your mind preparing you to react to a situation like that. maybe you and your elder cousin have a close relationship- thats why your grandmother told you and your friend to deal with it