The father was the one who found him. But that doesn’t excuse him from not being in the boy’s life for a year. The siblings hadn’t so much as spoken to him through the door for 6 months. Why the heck didn’t the siblings tell someone? Didn’t the school question where he was? As you said, where were the relatives, neighbors and friends? Unbelievable.
She’s pulled the kids from school some time back. Trying to homeschool? Giving homeschoolers a bad name.