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(TMZ)- Mama June's new man Mark McDaniel may be a child molester, but that doesn't mean he's a bad guy ... at least according to his daughter-in-law.

Peaches McDaniel tried defending her father-in-law on Facebook ... saying, "if you are going to judge someone by their past, look at your own first.  Michaels dad is an amazing man, as well amazing father."

She adds, "Peoples past are completely irrelevant to the present."

Tell that to the State of Georgia ... where McDaniel is now registered as a sex offender after serving 10 years in prison for forcing one of Mama June's daughters to have oral sex with him.

As we previously reported ... June and her man visited Peaches after she gave birth last month ... which is when McDaniel was pictured with his hands on Honey Boo Boo's back.