A Ticklish Affair (1963)

It's more fun than marriage.

A young widow Amy Martin with three young boys is investigated by the Navy after one of her children inadvertently sends out a distress signal in Morse code by the blinds on his upstairs bedroom window. Commander Weedon and crew observe the signal from their ship and investigates. He falls for the young mother and proposes marriage. However, she is reluctant to have her family live out of a suitcase and initially declines. Gramps tries to bring her on board to sail the sea of love with the commander.