Feuding joint tenants; how do I find common ground

[Loren Becker]

I have a property I have been woking to get under contract for over a year 450k unfortunately,
the owners Uncle and Niece are in different states and don't speak, Any ideas with getting to common ground. the property is a burn out SFH the assignment would be to a builder who would tear down and build FMV 1.2 range.
Thanks for the help