Apparently the old wives tale goes that you will have a pregnancy like your partner's mother did. Like, my DH's mother didn't suffer any morning sickness, just a bit of nausea, and thats what I've had for both of mine. My sister has bad morning sickness in all of her pregnancies, and so did her mother in law. So the old wives tale seems pretty accurate in these cases!!!
(Not sure how accurate it is really though, probably as much as all the other old wives tales!!)