But at least though there is no personal grudge between the Mayweather. In Nonito Jr case, it seems that his father some some grudge to settle with him and thus he wish that his son getting knockout and not becoming a world champion again.
We all know that Donaire Sr. is a trainer and being a trainer, he has keen observation of the physique of a boxer. I do not think that the Donaire Sr. has ill intention for his son but I believe what the Donaire Sr. stated is about his observation. Donaire Jr. is way beyond his prime and is in a performance decline while Alejandro Santiago is performing well in had learned a lot which is shown in his recent fight. Donaire Sr. also know the weakness of his son and it is possible that he thinks that the weakness will be shown in that match. Donaire Jr. has this tendency to try to one-punch KO his opponent and he becomes impatient doing that especially when the opponent is much shorter than him. We have seen it in his previous fights.
And his wish becoming true as he lost the fight against Santiago. But I do believed that blood is thicker than water and so after this, we might see them settling their issues and the family is closer again. Hopefully this can happen in the future.
I also agree, the father will always care for his son even if he doesn't show it. Maybe the father wanted fo his son to reach him first and fix things.