Do I have to file a 1042 tax form

Background – my husband was a naturalized US citizen who  resided in the US for 60 years. His son, however is a Canadian citizen living in Toronto with no financial ties to the US.  My husband recently passed away and I am the executor of his estate. He left our son a small inheritance. The IRD attributable to our son will be about $260 (interest and dividends only) and the calculated tax is about $40 (there may still be some outstanding dividends to be paid to the estate).  Our son will file a 1040NR tax form with associated NEC this coming  spring.

My question – As executor do I have to file IRS form 1042 (with its associated forms)?