My dh was 18 when his sister was born and 21 when his brother came..my mother-in-law was 8 mos. pregnant with his brother at our wedding... I half jokingly told her if she went into labor at our wedding I would not be a happy camper!..lol.. 3 years later we had our only child, a son. Fast forward 30+ yrs from our wedding, son is 27, it's funny when he is introducing his Uncle who is 3 yrs older than him to people, most do a double take..