Nothing wrong in brother and sister kissing each other, out of love or out of lust. If two siblings want to express their love for Black cat I don’t call it getting old I call it outliving the warranty shirt, let them kiss. And if they want to express their lust, let them have sex, provided it is consensual Why are ex-partners referred to as a “baby mama”? I also saw a question about a ‘toxic baby mama’, what does this mean? Also ‘cousin brother’, is he your brother or your cousin? I’m from the UK and unfamiliar with these relationships. “Baby mama” is a slang term for “mother of my child”. After a couple splits, they might no longer be connected through a romantic relationship or marriage, but they are still connected through having children together. “Baby mama” is a way for the father to refer to the mother.