Joseph was born in Jacob's old age, Genesis 37:3.
The Technicolor Dreamcoat was probably not a "coat of many colors" as rendered in the KJV. Accurate translation of the Hebrew would probably be closer to a "long-sleeved tunic shirt" which would suggest management, leadership or even royalty. A common laborer would wear short sleeves. Jacob's gift denoted that he didn't expect Joseph to do any of the manual work. His brothers probably understood this implicit meaning, and resented Joseph for the favoritism bestowed upon him. Genesis 37:4.
Their envy was aggravated by Joseph's talking about his dreams. Genesis 37:5-11. But Jacob "kept the matter in mind." v.11. Here, God refers to Jacob as Israel again, possibly indicating that he was again in closer fellowship with God.
Joseph sent to Shechem to check on his brothers. v.12. Shechem is about 90 miles north of Hebron, where Joseph lived. He finally found them in Dothan, about another 15 miles to the northwest. The brothers saw him coming, and wanted to kill Joseph. But Reuben, the oldest and the one to be held accountable as the firstborn, talked them into placing him in a dry cistern instead (intending to rescue him later).
The Ishmaelites, the descendants of Abraham's first son, happened by. The brothers sold Joseph to them for twenty pieces of silver. This happened while Reuben was not present. When he returned and found Joseph gone, he became distressed and tore his clothes.