My parents just built an extension onto their 3 bedroom house (just the 2 of them living there) because the dining table didn't fit comfortably into the kitchen

My parents just built an extension onto their 3 bedroom house (just the 2 of them living there) because the dining table didn't fit comfortably into the kitchen/dining room. A good chunk of the space is used up by a sideboard and a display cabinet full of fancy china which is used once a year at most. I asked them why they didn't just buy a smaller table but they wouldn't answer the question. I have a hunch their relationship has failed and has been for some time and they are using the extension as a distraction. Since I moved house earlier in the year I've had 5 boxes of "stuff" sitting under my desk. I make bravado about selling it but I haven't had the balls to yet. What if some day I need all those CDs of mediocre 90s indie? Instead I read endless blog posts by preachers of minimalism and take comfort in my good intentions to do something about my own shit, some day.