I should have been clearer-- I find it very plausible that people whose parents had an unhappy marriage are more likely to have trouble getting started on relationships, but that's what I find plausible, not what I have evidence for.
Behavioral genetics has only found weak effects from parenting (shared environment). While the nature of the research only allows for detecting large effects, and I doubt your specific argument has been studied, I generally assume such selection effects are weak unless there is evidence to indicate otherwise.
Edit: Unless you're arguing that if someone's parents are naturally bad at relationships, they too will be bad at relationships, but since whether a marriage is good or bad is generally more complex than that I don't think that's what you're arguing.
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