@FgoSegul
that's not exactly true. There is a thing about title inheritance - several people can't inherit it at once. What i'm implying - he have fourth highest position at the moment, but he won't have it after his brother succeded the title. Means that his father not in power anymore, and his lineage means much less.
True, he can stay in power if he support new king, but it would be entirely to the decision of the new king. If he would wish, he can even exile/execute him in fear of possible coup.
Generally in inheritance - one gets everything, and everyone else are just nothing. Most of the times they are send away to marry other prominent families to forge diplomatic relationships, aka they would be just diplomatic tools (cause they have bloodline).
It's nothing like "fourth highest position" in the tribe, it's instead "forth place in line for highest position". It's all or nothing.