I was replaced!
Marcus fell asleep on me today for his afternoon nap. After a bit, I placed him down on the bed to get some things done while I had a free moment.
About an hour later, I was sitting on the bed beside him while playing with Molly. He woke up, crawled right past me and picked up the water bottle behind me on the windowsill. Took a couple good sips, grasped it tightly, and fell back to sleep.
Is it possible to be jealous of a plastic water bottle?
Yes. Yes, it is.