Of course one would be obligated to tell a potentially (kosher) shidduch partner if the other party is a mamzer. It is an assur marriage and you cannot let it go thru (lifnei iver, like you pointed out.)
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Of course one would be obligated to tell a potentially (kosher) shidduch partner if the other party is a mamzer. It is an assur marriage and you cannot let it go thru (lifnei iver, like you pointed out.)