Maybe it depends on what the issues were that ended your marriage, but assuming these did not include severe abuse, many civilized people find a marriage unendurable and yet end it amicably and still feel able to support each other and help each other in emergencies. YOur behaviour sounds friendly and sensible, and for the ultimate benefit of yourself and your child. And in the end, a Court will decide his fate, not you - you're just helping that process take place properly. Your sister sounds rather too invested in this matter, which, so long as it is not damaging you, is really none of her business.
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