Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.02
Broken: version: 2.81 (sub 5), branch: master, commit date: 2019-09-03 16:04, hash: rBb3b59e3b5657
Short description of error
The parenting behavior is backwards in the outliner. When parenting objects in the outliner, the active object becomes the child instead of the parent.
Exact steps for others to reproduce the error
Create two objects and attempt to create a parent relationship using CTRL+P
[Based on the default startup or an attached .blend file (as simple as possible)]