Difficult quest (Red Dead Redemption 2)

Just a few steps from "Valentine" has a chance meeting with the grandfather by the name of "father" and his sons who build the house. And after a few meetings with them, when they are almost finished building the house, "father" asks us to get wood to finish the house. Where to find this wood? Passed it over, when he had reported the location. Tell me where to get it(or the name of the settlement, or screenshot of where the shown), and then$ 100 don't want to give him. Thanks in advance