Now that I'm awake enough to be coherent.
The cats all got outside yesterday, dad finally found the basement window open. And closed it. However, Brownie was still out.
Or so we thought.
When Mom got home last night, she found him in a corner of my sister's bedroom. He'd obviously gotten into a fight and was rather battered. Including a swolen infected leg wound.
He got a trip to the vet at 11pm. Yes, they're open till 2am, now. Cool.
Cleaned up, he still isn't too happy, but at least he's better.
Right now, he's all curled in the sunlight.