Do your parents have cell phone coverage? If so, that might be simpler.
Do your parents have cell phone coverage? If so, that might be simpler.
If you could set up a ptp link (id say Omni on sisters house and a directional one at the parents) as a bridge from parents to sisters house. 2Km with LOS is trivial to achieve.
As your effectively bridging the two houses any host in the parents house would be part of the same network and be seen as such.
As in the US the phone company's responsibility ends at the demarc trying to stop how your internal wiring is configured seems impossible:-)
Or just ignore that and don't tell them. as long as you're not doing this as a business or at large scale I couldn't possibly imagine they would notice.
Even if my parents got rid of their $120/mo satellite tv package, they couldn't replace it with a streaming service because of the data costs.
They offer decent rates for rural LTE with fairly large caps.