"Kris has gathered the family and made sure they would all be there for her," the source says. "They are so excited for Khloe. Her sisters are being super supportive of her… her family is rallying around her."
The source says that, despite photos and videos published by multiple outlets that allegedly show Thompson being intimate with unknown women, the family is trying to make sure Khloe focuses on the thing that matters right now, which is her baby girl.
"The video hasn't stopped the Kardashians from making sure her day will be one of love and respect," the source says. "They won't let any news change the importance of how beautiful this birth is for Khloe."
"They want her to focus on having a healthy experience," the source continued, adding that Khloe's family is trying to keep her from looking at "any of the news right now."
The allegations come as a shock to the Kardashians, who "really like Tristan and have welcomed him into their family," the source says.
"At this point, Khloe's family wants nothing more than to believe that he is a stand-up guy and that this was a setup," the source adds, "But only time will tell."
On Tuesday, the Cleveland Cavaliers player made headlines after The Daily Mail obtained video of what appears to be Thompson making out with a mystery woman at the New York City nightclub PH-D Lounge on April 7.
"The video going around shows Tristan in a loud club briefly talking to a girl, nothing more," the source said. "Tristan was there for roughly an hour and left with his teammates. Khloe and Tristan are happy and focusing on the birth of their daughter.”
Shortly after the video went viral, The Shade Room published photos of Thompson with what appears to be the same woman from the bar. In the wake of the reports, TMZ also published a video of what appears to be Thompson kissing and getting cozy with two women at a hookah lounge outside Washington, D.C., in October 2017. Khloe would have been three months pregnant at the time.
For more on the allegations surrounding Thompson, watch the video below.