A source recently told PEOPLE that Thompson has been transparent with Kardashian about the current situation with Alexander, and immediately informed her when she requested that he take a paternity test.
"Tristan has been open with Khloé from the beginning when it comes to the paternity test," said the source. "He told her that he needed to take the test, but also that he didn't believe that he is the dad."
"Khloé and Tristan have both worked hard to get to the point where they are now," continued the source. "Regardless of the issues that Khloé has had with Tristan, he has always been a responsible and great dad. Khloé will continue to support Tristan."
According to the source, they spent Mother's Day together as a family earlier this month.
"They are amazing co-parents and are able to give True a great upbringing together," said the source.
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