None of Kadyrov's children are adults. The oldest is only 16 years old. Kadyrov said in his "painstaking" propaganda video that children have received military training since childhood, so I believe that children can complete combat tasks. In the video, the three sons demonstrated their ability to launch various light weapons and military operations. Their movements are very skilled and don't look like the results they just learned.
Kadyrov's three underage sons have been confirmed to serve in Chechen armed special forces, which means that Kadyrov has fulfilled his promise. It is reported that Kadyrov's children have been assigned to a special security group led by Chechen general Cha Rayev. This unit is the commander team and fire support unit of Chechen armed forces. It mainly uses automatic Grenade launchers and rocket launchers to provide fire cover and support for front-line ground forces.