Travis Barker and his on again/off again love affair with his ex Shanna Moakler continues. This week, they are duking it out via Twitter and MySpace over her lack of parenting skills. These two definitely LOVE the drama. Also, very very Scorpio of Travis.

TMZ Reports:

Shanna Moakler is throwing down the gauntlet over allegations made by her ex-husband, Travis Barker, scoffing at his claim that she has an uncle who’s a sex offender.

Long story short — Travis accused Shanna of endangering the lives of their kids by letting them hang around her sex offender uncle. One problem — Shanna doesn’t have an uncle … so she says today.

She tells us, “I don’t have a uncle, second, I would NEVER endanger the lives of my children , I find making public spectacles humiliating not just for our children but for our entire families.” Interesting, because yesterday Shanna said on her Twitter she and her uncle were planning on suing.

Travis, call your lawyer and take it to a judge if you’re that concerned. Blabbing about it on Twitter certainly isn’t going to help you.