Young couple in need of help

[sumguy27]

Alright quick question here since I can't believe it comes down to this phone I got for fathers day.

1. Should I just give it back because the phone is under name?

2. Should I then tell her to fork up and pay for half the car note and insurance then?

3. Or should I take both cars away from her since I paid for both of them. (Seems so childish of me to do)
The reason I ask is because like the post earlier I don't want to try and get even with her anymore. I was just thinking for the kids so I thought if who ever has the kids shall get the SUV instead of the tiny corolla. But I have always paid for the cars and I finally paid of the corolla this year. Which originally was her first car I bought her. The corolla is in my name. The SUV however is in both our names. I don't want to be the jerk and say fine then pay half of the bills. But my sister is telling me too do it so she knows how how hard it is to be a single mother? Idk I don't want to do the wrong thing. And I'm just laughing because it comes down to this blackberry which is under her name that's why she wants it back. GRRR!!!! We sound like two childish kids. I'm sorry if I offend anyone.