Okay, imagine this. There is a Mildly wealthy European man. A nobleman, though very minor nobility, or perhaps he's a mildly successful merchant. He has a decently sized manor, but he's out for the day most days. He doesn't need much staff at all, just someone to clean and cook while he's away. So, he hires a live-in maid who just so happens to also know her way around a kitchen as is right and proper. She has a stipulation, however, that her husband move in as his job has gone up in smoke and there's immutable evidence that he is not just sitting on his ass, he is undeniably looking for work though tough times have dried up all the usual work opportunities. The nobleman says "Alright, but his room and board will be taken from your pay as I will have to purchase extra necessities to account for him." And allows them to live in his manor. He's got the empty room for them, after all. Nowhere in this scenario is anyone being unfaithful or trying to be skeevy. Is that cuckoldry? If no, then this scenario presented in OP is not cuckoldry. If yes, then this scenario presented in OP is cuckoldry.