Yep! Actually if he was tried and not convicted, none of my stuff about housing difficulty applies, but also, maybe LW should try not to assume that being declared not guilty means he's dangerous. Even if he did have a history of collecting child porn, the vast majority of people who use child porn never abuse a RL child, and the vast majority of people who abuse RL children aren't interested in child porn. I still wouldn't let him babysit, but it's not like he exudes some kind of miasma that will endanger your child through the walls of two houses.

And he's presumably still going to be part of Partner's family, so if you want to have kids with them you're going to have to figure out that they can be OK while in Brother's vicinity somehow, whether you move in next door or not.