Looking back on the replay, I don't think I was trying not to push my brother. At least on the straights I pushed him for sure, which you can see on the replay. In my opinion, it didn't help our group much that the group ahead of us was outnumbered, more momentum. Anyway, if you weren't happy with that, you could form a group and overtake us.
We thought about to overtake and lead the group, but weren`t sure if it goes better or not. We avoid to be in a 2-row for several laps.
In the end it doesn't matter.