The article presents some methods of uncertain, human-originated knowledge grounding, accomplished with the use of ontologies with uncertainities and several ontology ABox joining techniques. Several people with uncertain knowledge about some domain write down their domain knowledge in a form of simple text in english. The goal is to obtain uncertain ontology ABoxes, representing their knowledge, and to join them, resulting in total, grounded, uncertain domain knowledge. The joining process takes care of different facts description details, possible facts conflicts as well as varied facts certainity degrees and people credibility.