Private User - there is no geni to advise. There are profile managers you can offer correct information to, but you still want to reject bad matches.
For historic profiles Geni has a Master Profile utility as part of our volunteer curation program. The idea is that it’s the single representation of a person, is sourced and looked after; all other versions of a profile to be merged into it. Data fields and relationships can be locked. I think this might be what you’re looking for, but be aware, it’s used for historic people and notables - not for close relatives.
See https://help.geni.com/hc/en-us/articles/229704047-What-is-a-Master-...