Yeah, that's a real head-scratcher. Son Tokens are worth 5x the others, which is probably still a bit low, but the rest are exactly equivalent in Standing for no obvious reason. Maybe the idea was the reinforce the idea that we should only be using them for rank-ups and Grandmother exchanges? But then why have them be worth Standing at all? And even then, the balance is off because Father tokens are way easier to get than Daughter and Otak tokens, which are both way easier to get than Son tokens (unless you're taking full advantage of the pet donations).
I just did it again 30 seconds