it's unusual for it to happen in such a high profile way, obviously. but children who turn to parents for support are often shamed or rejected or told they need to make the marriage work.
this is why people stay in abusive situations. literally no one will believe or help them. not law enforcement. not their families. not friends. no one.
and it's for more or less the same reason Moreno is treating it as an inconvenience to be ignored.
families often are interlinked in a range of ways, which can include finance, careers, social networks.
backing the victim can mean damaging a range of relationships and opportunities. it's a lot easier to insist nothing is wrong and demand the victim fix it, ie, shut up.