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May's house is before the desert as you go through the missions you unlock its location when the protagonist's mother brings you, talk to the protagonist's mother every day and give her gifts this will unlock missions to advance at least I did that and so I unlocked it

Go to the desert and do the desert missions you get the shovel in a mission that gives you skyler, called Digger, which is activated after completing the first race in the moonlight. I hope I've helped