Our expert says:
From a prior relationship with someone who was NOT trustworthy, you can indeed carry a burden of over-cautious suspiciousness of even the nicest of new companions.
But the problem you describe is about more than trust. It's about ( I think )m whether to tell your husband about the allegations that his father sexally abused his sisters. IS it possible that indeed he already knows about this, but for various reasons has not chosen to tell you yet ? Could you ask the BIL or SIL whether they know if your husband knows about this ? Mention to them your concerns about the stepdaughter.
If the BIL knows, presumably based on what the direct victims, the SILs told him, then his story is probably accurate, but may be a Family Secret.
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