I notice this:
In Genesis, twin births are reported twice. The first-born is reddish or the expected first-born is marked with a red thread.
Isaac's sons are twins.
Esau - reddish all over like a hairy coat
Jacob - obtains Esau's firstborn blessing, camouflaged with sheepskins
Judas' sons with Tamar are twins.
Serach - is the first to stick his hand out of Tamar's womb, gets a red thread as first born, but pulls his hand back.
Perez is born first.
The family tree to King David. or Jesus does not lead over the "red" sons.