Wikitree does not have an outright delete feature. However, it is amazing how much you can modify the info. This includes parents, spouses, siblings, and children.
If all else fails and you have a more appropriate profile you can "merge" the 2 together. This effectively removes 1 profile and put the info into the new profile where you can change it as needed.
This only affects the one profile however. If there are wrong parents attached, merging the profiles may fix the parents for the one profile but it will leave the other parents orphaned and screaming in the abyss in sheer loneliness. You might want to keep a log of all the profiles by writing down their links like smith-2317 or anderson-983. Then you can fix those as well.