I know that every SO should get an invite, however we have a bit of a sticky situation. The issue is FI's sister. We're still debating on wether or not to invite her, but in the case that we do I am not comfortable inviting her fiancé. This man is a convicted felon for crimes against children. There will also be one child in attendance at the wedding; FI's young daughter. As far as I know there are no restrictions on whether or not he can be around children, and there is no way that she would be left alone with him at any time. However I feel like our first responsibility is to protect her from people like this, and inviting him to our immediate family only wedding will send the message that he can be trusted. Do you think that in the case that we do decide to invite the sister, it would be alright to leave him off of the invitation?