[souffle]

You need to separate them LM. They are only together as they are still quite young. They still have baby faces and coats there and they have never known anything else. Any day soon their hormones will kick in and there could well be a huge fight. The coats are hormone driven and as you can see those are getting quite long now so they are maturing quickly. I'd do it very soon. The longest we have had males together (siblings) is 10 weeks which was quite a while. Females will start to bicker at 5 weeks or so when they start coming in to heat.
Do it now then you can relax and know they are safe. Remember no play dates etc as soon as they are separated. That's it - batchelor life!