Legal question - property easment related
I've got some acres, my neighbor has some too. There is a 3" water line across my property that is part of our community water system (12 family water users group). There is junction box with my neighbor's and my water lines coming off the main line. The main line ends at the junction box. There is an easement on my property for the 3" line and an easement for my neighbors 1.5" line on my property. Neighbor is subdividing his property to his sons. His son is a dick and says that he can put a water line across my property to his property because his dad already has an easement. I think he requires an additional easement for the line to his property. His line would end up being 10' from his dads line.
If he needs an easement to install his pipe and I am a dick and don't grant (or sell) him one can he use his dads pipe to get water to his property?
Clear as mud?