Similar to many Cults, IMO any extended family has been shunned and isolated from the TB Family...due to the family's perceived threats that any 'outsider' will cause. In a cult, questions and doubts are a threat. How the (two children of Venuska's ) grandmother was able to actually see her grand-babies is a mystery to me. I bet she has much to say though just not publicly. There was the uncle....or 'like an uncle' in the claims made by the family, but we have not heard from him publicly either. HT-B is not an only child, where is her family's support? ST is an enigma, so if there is any extended family on his side they remain silent as well. Then there is Tenji, father of two of Venuska's children who more than likely has been talking to authorities and has remained silent publicly.
The only public support I can see is from the two community member commenters on FB, who actually never met Evanna or the TB Family. They just support the family claims against the DA.
Speaking from my own experience, the perceived protective bubble that a cult uses to shield them from the outside world is very real to any family who is NOT a part of the cult.