mutual    

- directed by each toward the other or the others

- having the same feelings one for the other

- shared in common

tie    

- line, ribbon, or cord used for fastening, uniting, or drawing something closed

- a structural element holding two pieces together

- something that serves as a connecting link

- a bond of kinship or affection

- equality in number or in a contest

- a method or style of tying or knotting

- something that is knotted or is to be knotted when worn