ST. PETERSBURG, Fla. -

When two girls, aged 12 and 14, were arrested in the bullying-suicide investigation in Florida, many wondered about their parents and whether they should be held responsible.

The mother and father of the older girl went on national TV and defended their daughter and themselves. They said they often checked their daughter's social networking activity and don't believe their daughter bullied Rebecca Sedwick to suicide, as authorities have charged.

Police considered charging the parents, but Polk County sheriff's spokesman Scott Wilder said Wednesday that so far they can't prove complacency or that the parents knew about the bullying.

Experts say parents should use Rebecca's case to talk to their children about bullying.