The star of Catastrophe and Home Sweet Home Alone answers your questions on everything from family tragedy to the value of comedy Rob Delaney " comedian, actor, writer, tweeter, activist " co-wrote and co-starred in the Channel 4 sitcom Catastrophe with Sharon Horgan. Now he has a starring role in the film Home Sweet Home Alone. He has also written and spoken movingly about the death of his two-year-old son, Henry. H…