My Nord character Sker Fjensson recently married the love of his life, Mjoll the Lioness, but when I whent to my house in Riften, I noticed that Aerin has moved to the Honeyside as well.
Anyway i can get rid of this guy?
Sorry, Aerin is a permanent asset that will always accompany Mjoll. He is programmed that way, so that even if you move into any house, he will be there and follow her normally. He is not essential however, which means you can kill him. This is NOT advisable however unless done a certain way.
If she sees you kill him or if he is dead near your presence, she will forever be "sad" and will not engage dialogue with you anymore and she will divorce you immediately. If she sees him die by an enemy, she will be "sad" and not engage dialogue with you for a few Skyrim days.
However, if he dies by an enemy and is not within sight of Mjoll, she will react as if nothing happened. The best way to do this is to move to Lakeview Manor and wait. He will (for some reason) walk away ( I guess to go grocery shopping?) and eventually run int two Mudcrabs in a pond. If you play on Legendary, the will indefinitely kill him and your problem will be resolved.
Hope this helped!!