Actually, first cousins once removed!
The most recent ancestor they both share is Kronos, father of Zeus and Poseidon. This level is siblings. Going further down, to cousins, is Hercules and Triton. Ariel is a whole generation down. Because Hercules is closer to Kronos on the generational ladder, and Kronos being his grandfather, the label becomes "first cousins" (Tip! Count how many "G"s are in the closest ancestor's title. That's the degree for cousins. i. e. "G"randfather="first" cousins). But wait! you say. Ariel's on a different level; Kronos is her GREAT-grandfather! First cousins applies to Hercules and Triton, not Hercules and Ariel! And, well, you're right. Good observation skills. That's why we have that "once removed." See, those numbers are only for relatives on the same generational level. This part is simple, just like finding out if it's first or second or whatever cousins. How many degrees of separation are there? In this case, it's only one, hence "once removed."
They might even be third cousins. Let ME explain. So Ariel would be normal cousins with herc if she was the direct daughter of Poseidon. So, triton is Herc's first cousin, that makes Ariel his second cousin.
...I don't understand. What am I doing wrong? There's literally a comment explaining why you're wrong. There's a video. Do you need visuals? I can get you visuals.
no no no ... you don't need to be someone's brother to be their child's uncle... Hercules and Triton are 1st cousins... Hercules' would be child is Ariel's 2nd cousin Thus making Hercules, Ariel's uncle :p
The most recent ancestor they both share is Kronos, father of Zeus and Poseidon. This level is siblings. Going further down, to cousins, is Hercules and Triton. Ariel is a whole generation down. Because Hercules is closer to Kronos on the generational ladder, and Kronos being his grandfather, the label becomes "first cousins" (Tip! Count how many "G"s are in the closest ancestor's title. That's the degree for cousins. i. e. "G"randfather="first" cousins). But wait! you say. Ariel's on a different level; Kronos is her GREAT-grandfather! First cousins applies to Hercules and Triton, not Hercules and Ariel! And, well, you're right. Good observation skills. That's why we have that "once removed." See, those numbers are only for relatives on the same generational level. This part is simple, just like finding out if it's first or second or whatever cousins. How many degrees of separation are there? In this case, it's only one, hence "once removed."