EXCLUSIVE: Lindsay Lohan's Treatment Team Wants Her Parents In Therapy

That's the inside story of Lindsay's progress at the Betty Ford Center in Rancho Mirage, California and a key issue as the star faces her

addiction issues.

A source with knowledge of the situation tells RadarOnline.com exclusively that Lindsay, 24, is working through some "very intense issues regarding her family, specifically, Michael and Dina's contentious relationship.

"The fact that Lindsay took the first step and has been spending time with her father, for the first time in years, is very significant and important for her ongoing recovery. The fact is, when an addict has a supportive, loving family, their recovery is that much stronger, period."

After Lindsay was granted a day pass from the Betty Ford Center last weekend and returned to her Hollywood apartment reports surfaced that Michael was refused entry into her apartment building.

But according to a source, Lindsay turned Michael away not because she didn't want to see him but because she was implementing the recovery tools she's been taught at the Betty Ford Center.

"Lindsay was surprised that Michael showed up at her building. Her refusal to see him wasn't out of any ill will, but Lindsay is trying to enforce boundaries that her counselors have been working with her on," the source told RadarOnline.com.

But don't expect Lindsay's mom, Dina, to greet Michael so warmly. The Lohan matriarch is not embracing her daughter's reunion with her father.

"Dina isn't onboard with going to the next family week at Betty Ford if Michael is going to be there. When Lindsay and Dina have spoken on the phone, Dina hasn't spoken negatively about her reunion with Michael, but

she hasn't exactly embraced Lindsay's decision to allow Michael into her life," the source said.

"Dina certainly isn't encouraging the relationship between Michael and Lindsay. Lindsay shouldn't have to navigate between her parents, she is grown-up, and she shouldn't be used as a pawn.

"Dina's approval is very important to Lindsay."

According to a source, Lindsay's treatment team is hopeful that Dina will come around, and participate family counseling while Lindsay is at Betty Ford.

"If Dina doesn't, Lindsay will work through that. She truly is getting stronger every day," the source said. "This isn't about Dina, this isn't about Michael, it's about doing anything possible to give Lindsay the best tools, and environment for her to maintain her sobriety."