I have Chief my pied, pearl cockatiel and two IRN girls.
The girls think they are above associating with a mere 'tiel and he could care less because he thinks they are mean b*tches... and they are.
He loves me most, even more than Baby loves me. A 'tiel is an AWESOME kids bird/first bird. You have made an awesome decision.
My family would not interact with the ringnecks but love lil' Chief. They handle him and now dont feel left out, thereby poking at my IRN's through the cage.

Really dislike when they do that but they just want to play with the little meanies.
Cockatiel's are SO sweet. They want to be loved and want to love. They are, in my opinion, completely different than an Indian Ringneck. With the exeption of both sharing basically the same diet.
Good luck, lets us know how it works out. I am assuming you know better than to cage a 'tiel with an IRN but just in case let me put it out there. CANT... You'll come home to a dead tiel if your IRN's are anything like mine.

I would imagine many others would advise the same.