Tingle is a Kokiri. See his clothes and size. But he got banned from the Kokiri Forest by the Deku Tree for being the perverted, selfish idiot he is.

Link's mother was a brave warrior and fought in the war. Thats why Link is such a good swordsman. Its in his genes.

She took damage in the war, and Tingle made her pregnant with force. She fled to the Kokiri Forest where he couldnt enter and irritate her again. She gave birth to Link before dying form the wounds of war.

In sorrow, Tingle moved to Termina.