Who do i testify against in court?

next monday, my aunt and uncle are both going to court to settle a divorce. my aunt wants me to testify against my uncle, and say that he acted "ual" around me. However, this is not true. likewise, my uncle wants me to testify against my aunt, saying that she once attacked me with a knife. (this episode was accidental, because the knife slipped from her hand and struck the back of my arm). Either way, i am caught in a crossroad as to who to testify for/against