The best interest of the child standard is the determining factor for child custody cases. The court shall determine custody in accordance with the best interest of the child. The court shall consider all relevant factors including:
1) the wishes of the child's parent or parents as to his custody; or
2) the wishes of the child as to his custodian;
3) the interaction and interrelationship of the child with his parent or parents, his siblings and any other person who may significantly affect a child's best interest;
4) the child’s adjustment to his home, school and community;
5) the mental and physical health of all individuals involved;
6) the physical violence or threat of physical violence by the child's potential custodian, whether directed against the child or directed against another person;
7) the occurrence of ongoing abuse as defined in section 103 of the Illinois domestic violence act of 1986, whether directed against the child or directed against another person;
8) the willingness and ability of each parent to facilitate and encourage a close and continuing relationship between the other parent and the child.
