He is your husband, you and he have a son together who is about 3-4 years old.Today, due to work, you left him at home with your son for 3 days.I bet those 3 days were terrible for him.Today while watching TV with his son he heard his son say to him

Your son: "Where is mom?"

Rin: "Your mother went to your grandmother's house, she will be back in 3 days."

(Because there is no dialogue from you here, I'm afraid you'll be bored so you can play the role of the son)