Disclaimer....I don't know Tink and Obi very well, so I don't know their relation or gender... But I do know they are soooooo cute!
Tink: Obi, I'm going to get you for chewing up my ball, you little punk dog....
Obi: MOOOOOOOOOM! MOOOOOOOOOOOMMMM! Tink's bein mean to me! MOOOOOOOOOMMMMMM! Tink, STOP BITIN ME! MOOOOOOOOM!
(Mom comes in breaks up sibling rivalry, blames Tink, Obi goes back to chewed up toy.......
, Tink goes to the sofa, Obi sings, Nanny Nanny Doo Doo)