Kate, Leah, Joel and Jon Gosselin Kate, Leah, Joel and Jon Gosselin

The Pennsylvania Department of Labor is investigating whether Jon and Kate Gosselin's hit TLC show Jon & Kate Plus 8 is violating child labor laws, a spokesman told TVGuide.com.

"The Pennsylvania Department of Labor and Industry's Bureau of Labor Law Compliance is conducting an investigation, but because it's ongoing, there is no information I can provide about the investigation," spokesman Christopher Manlove said.

The bureau is complaint-driven, meaning it is required to look into all filed complaints, Manlove said.

TLC said the program, currently in its fifth season, "fully complies" with all state laws.

"TLC fully complies with all applicable laws and regulations," the network said in a statement. "Jon and Kate + 8 is no exception. For an extended period of time, we have been engaged in cooperative discussions and supplied all requested information to the Pennsylvania Department of Labor. We will continue to engage the appropriate officials and meet any standards or regulations that are applicable to TLC productions."

Earlier this week, Kate Gosselin's brother and sister-in-law, Kevin and Jodi Kreider, told The Early Show that they believe the Gosselins' eight children have been exploited.

"We're speaking out now because we want to be the voice of our nieces and nephews," Kevin Kreider said. "We're seeing it turn-tide, that they're being viewed as a commodity."

The Kreiders, who appeared in early seasons of the series, grew concerned when filming increased — Season 5 will contain 40 episodes — and became more invasive.

"[The children] don't want the cameras around. ... They would say, 'Aunt Jodi, I don't like the cameras on every vacation with us. I don't like them,'" Jodi Kreider said. "Kids have bad times, bad moments, they cry — and having the camera zoom in on a crying child, I mean, this is just — this should not be a form of entertainment."

Follow TVGuide.com on Twitter for more breaking news and scoop.