In-laws living in the same house could be an issue with a young couple. Hope the walls aren't thin.
But on that note, it can work out. My wife spent the first 3 years of her life living with her parents upstairs from her grandparents and uncle all in the same house. And her dad is 13 years older than her mom. His in-laws did not care for him all that much. He said that he worked as much overtime as he could.

They finally bought their own house.
It was fairly common to live with 'her' folks after marriage around here to save enough money to get your own place.