I see no reason to be in contact with the majority of them. One who was abused by her XWH still speaks to me, but the rest closed ranks, as stronger08 said, so why bother.
Xpos went from seeing them once a week for breakfast with me to taking the slut with him the next week and they were fine with it. No love lost and no time wasted on them. A couple of them told me that I will always be part of their family ( after over 40 years) and they will always love me, but I have not heard a thing from them since the slut started coming around with him. Nor have I contacted them.
If you really want to try to see them, is there someone who can let them know you are there and let it be their choice to contact you or not? Might prevent them hurting you if they react badly to your direct contact.
(((Imaf))) I hope it goes well for you. Remember that it's true that blood is thicker.........