I am not sure what the extent is of honoring your parents after their death. Do you have to honor all their wishes (except for those that violate Torah law, which you would need to disobey even while they are alive.)
A specific example:
A parent tells you not to be in contact with someone because they harmed the parent in some way (financially, emotionally or physically.) Do you have to follow these wishes? Does it matter if your parent tells you to cease contact with a sibling or other relative (unlce) or if it was a friend of your parent?