Does anyone else have trouble getting parents to adhere to your parenting style?

For instance: I personally prefer my son NOT be rocked to sleep. I don't want him in the habit of needing to be held until he falls asleep. However, my mom and MIL both joke about how they do it when I'm not around and I can tell a difference in him! He gets fussy when he's tired and won't stop until he's rocked.

No, it's not a big deal but only one of many issues I've had to address.

Another example: My sister doesn't want anyone to smack her LO's hand (for discipline) and my mother's response was "well I do." and that's it!