Interesting. L mentioned the brother in this podcast but they also said no family has helped search. First I thought the fingers were being pointed at siblings of Sandra. Are they being pointed at the son to?
If you read Sandra's official missing page on Facebook, which is adminned by family (I believe this type of page is allowed under Websleuths TOS), you will see that there are many members of her immediate and farther out (cousins, etc) family who were and are engaged with the searches. It's not just the daughter and SIL who are looking for her.
The specific allegations in the podcast did not deal with Sandra's nuclear family, so to speak.