A husband's last wish
A elderly couple had three son's. There was something odd with the boys in that the elder two had black hair, were dark skinned and heavily built just like their father while the lastborn was slender, light skinned and had black hair.
The husband fell ill and it was clear he couldn't recover so he asked his wife, "Honey, before I die I want you to be honest with me - who is the father of our lastborn?"
The wife then replied,"Indeed he is our son, please do trust me."
The husband then passed on and the woman then muttered, "Good Heavens! What if he asked about the other two?"