Would you believe your daughter if she said her step dad touched her?

My friend which is my baby’s father brother baby mother, came to me and said her daughter told her mom that her step dad (baby dad brother, which is her baby father) , touched her. No one wants to believe her. My baby dad even said his brother isn’t like that and that he wouldn’t do a such thing. But me personally, I believe her. I grew up with my family members touching me and no one believed me but my grandma so I 100% believe her! Now they’re mad at me for being the only one believing her. I’m sorry but i don’t put shit past any man! I told my friend she need to kick him out immediately! The girl is 15 years old with a very mature and pretty shape! Am I wrong for believing her? I mean he’s already gotten a 17 year old girl pregnant while dating her so why not believe he likes younger girls? He’s 27 years old he could have gone to jail for that!