DEAR ABBY: I live on the bottom floor of a duplex with my wife. My brother-in-law, his wife and their two sons, ages 4 and 2, are upstairs. Since the 2-year-old was born, he’s been very rambunctious and fussy. I consider my BIL a good parent overall, but for a while now, I hear him blow up, scream, curse and shout at the younger child. I don’t think it’s healthy.