OK, I am commish in a H2H dynasty league. 12 teams, six of us know each other in person, three of the other six have been in the league over five years with the rest of us. We have never had any collusion issues, and really no major complaints. However, an issue has arisen. One player has informed me that he will be bringing his only computer into the shop for 2-3 weeks for repairs and service. He asked for permission for his brother to play his team during this period. However, his brother is also in the league, which is where my quandry lies. If they were willing to come to me beforehand, I think their motives are pure and no shenanigans are in the works, but will the other teams feel the same way? I told them I would have to think about it for a few days, which they were ok with. I told them that IF it was accepted that no trades would be allowed between the two teams during the period, which they agreed with. I also said any trades involving the team that has no computer access for three weeks would have to be verbally agreed to me before it goes through. They both also agreed to this, but there has only been one trade in the whole league all season anyways, so it likely wouldn't be an issue. The two teams do not face each other during the three week period, so there aren't any issues there either, however both teams are in the top four, so standings could be affected.
So, I guess my question is how do I handle this? I don't think it will be an issue with the six who all know each other, but I don't want anybody to feel uneasy. Should I hold a vote? If so, is simple majority (6 of 10) be enough or should I aim for three-quarters, which is one additional vote?
Should I just allow it and let it go ahead unannounced? Should I allow it and announce it?