A great day...until it stunk

Today was great. We went to school town early so John could have lunch with one of his old professors and a collegue before one of John's last day of teaching. He has been teaching as a adjunct and it's been a great experience. So we went to Uncle Mikey's early and had lunch with him & Ali. Buddy took a great nap (except for the waking up part 30 minutes in - poor baby is sick with a stuffy head and it's been hard for him to sleep). Then we went to the park (and it wasn't disgusting this time) and spend a couple of hours there. Back to Uncle Mikey's house for dinner (a French toast recipe you let soak in your fridge for 6-12 hours then bake in the oven ) and family home evening. Mike shared his experience of Passover dinner and Easter week that he experienced while going to school in Jerusalem and Buddy watched UP.
Then we got home and for some mysterious reason our house stinks. Well not our whole house, just the kitchen/dining room / living area. I checked the windows downstairs and the whole basement seems (and smells) normal / fine. But our house stinks upstairs.
So I've turned on the candle warmer in Buddy's bathroom and we're in our room with the Scent Bug going and the door shut.
The overhead fan is on in the kitchen so hopefully by the time we check on Buddy and go to bed it doesn't stink any more.
Here's hoping!