From the Super Mario Wiki
Pine is a somewhat elderly Mushroom woodcutter who lives in a small village located in the Mushroom Woods. Not much is known about Pine, except that he has a wife and two children, the three of whom are extremely minor, unnamed characters.
Pine served as the resident woodcutter for the citizens of the Mushroom Woods, including Gramma Toadstool. One winter, King Koopa travelled to Pine's village and stole everyone's supply of firewood. With no wood to keep warm with, the citizens froze up, and remained that way until Toad arrived with Mario, Luigi and Princess Toadstool, and thawed them out. Pine explained the situation to Mario's group, and while they went to work on gathering more firewood, Princess Toadstool left to visit Gramma by herself.
Gramma later paid a visit to Pine, claiming that she had just won a year's supply of wood. Pine explained that he didn't have any wood to give to her, implying that the contest she won was a hoax. With Mario, Luigi and Toad's help, they deduced that King Koopa made it up, and travelled to Gramma's cottage, leaving Gramma back at Pine's. However, it was at Pine's cottage where Gramma was ultimately kidnapped by three Koopa Troopas.
Eventually, Mario, Luigi and Toad rescued Princess Toadstool and Gramma from King Koopa, and were able to return all of the stolen firewood back to Pine, who distributed it out to the villagers, confident that it would be enough firewood to keep them warm for the rest of the winter.