Here is an article on how two pilots both log PIC time from AOPA. It breaks it out pretty clearly. If in VFR, the Acting PIC will be the safety pilot and log PIC time. The pilot under the foggles as the sole manipulator of the controls can log PIC time as well.
It is a different case if you are in actual conditions, but the article covers that as well. Bottom line, if someone wants to split costs with this kid to both build time, then you can do it.
https://www.aopa.org/training-and-sa...mmand-pic-time