Katherine Jackson took Michael's children to the Jacksons' "Unity Tour"

Shortly after family members kidnapped her and tried to kidnap Michael Jackson's children, Katherine Jackson took Michael Jackson's three children at the Jackson brothers' "Unity Tour", even though one of the members, Jermaine Jackson, is actively trying to overthrow the Michael Jackson's Estate.

TMZ obtained footage of Katherine arriving at the concert in Saratoga, CA last night (to a small round of applause from the crowd) where Marlon, Tito, Jackie and Jermaine are continuing their tour, despite the current family rift. 

Katherine wasn't there alone ... Prince, Paris and Blanket tagged along with their grams -- who just last week was reported missing after spending a week in Arizona with other members of the Jackson clan. 

During the concert, Jermaine -- who is on opposite sides of the feud than his band mate brothers -- played a whole set by himself ... singing several songs as a solo act. 

TMZ was told Michael Jackson's children, who were watching from the crowd, didn't appear to be having that much fun.

During their concert, Jermaine caught the occasion to say, " We are a family ... sometimes it seems to get complicated."

Jermaine continued, "We're ONE ... the Jackson family is one. We are one family and we WILL heal, I promise you."

Of course, Jermaine wasn't just talking to the fans .. his mother Katherine and Micahel Jacskon's children Prince, Paris and Blanket were all in the audience ...though sources tell TMZ it didn't seem like the children were very amused by the speech.