extender
I visit my mother who does not have Internet and need to extend the signal from my brothers house next door which is maybe 100 yards to 150 yards is there an extender to do that and if so would I put it in his home or my mothers?
Generally, the best place to install an extender is halfway between the devices needing a connection and the router. If that would be outdoors between two homes as in your case, pick an inside wall that is closest to the halfway point.
However, if the signal path passes through a wall or floor at a shallow angle, that can be worse than any distance problem. In that case you can get better results by installing an extender away from the direct line-of-sight between computer and router, so that the signal zigzags through walls and floors as perpendicular as possible.
I had horrible problems with only 50 feet between my computer and my router because my office is under concrete stairs supported by a concrete wall. I got excellent results with an inexpensive Netgear WN3000RP right outside my office, with a zigzag 90 degree path to dodge past the concrete.