Im sorry but only treatment providers and your own law enforcement departments can say whether you sexually abused your baby cousin or not.

heres why... you are in greece so only greece's laws can apply since the problem happened in greece. only you and your treatment providers and law enforcement knows what the laws were when you were 8 or 9, whether children 8 or 9 used to or are arrested for things like this..... theres also something called statute of limitations on laws too only you and your treatment providers and law enforcement there will be able to tell you what the statute of limitations on sexual abuse are/ were the year you were 8-9

my suggestion is talk with your medical doctor or a mental health treatment provider or call your local police department and ask if they know what the laws are/ were about this kind of thing. they will also know how to go about researching such issues in your location.