Would you say you knew? Or Keep quiet?

[Nonose]

I don't really want to say too much but if you found out a shocking secret about a close family member (It involves a serious conviction of an adult child) and you hadn't been told about it, would you say you knew? I don't want to judge or condemn but I would like to support the family member however, for whatever reason she has felt the need to keep this a secret. I'm fairly sure other members of my family do not know. It keeps going around my head. I just feel it will be weird to be with her and know and not say anything but at the same time I don't want to upset in any way - she is absolutely the loveliest person. I certainly won't be telling any other family members.

I would guess she has her reasons for wanting privacy, and has a confidante if she wants one.

I should respect her privacy and keep it to myself.

Agreed.

Definitely don't say anything.

Don't say anything. She has her reasons for wanting privacy on the Matter

As it doesn't appear that she has chosen to confide in you, you can best support your relative by interacting with her as you've always done which means that you must refrain from hinting that you are aware of something which she doesn't want you, or anyone other than those she has chosen to tell, to know.