The same holds true for revealing to the groom the affairs of the father-in-law. That is, if he knows of an internal illness of the betrothed but they are concealing it from the groom, the revealer is not suspect of the issur of rechiluth (but the required conditions must be met).
וְהוּא הַדִּין לְגַלּוֹת לֶחָתָן אֶת עִנְיַן הַמְחֻתָּן, גַּם כֵּן דִּינָא כַּנַּל, דְּהַיְנוּ, אִם הוּא יוֹדֵעַ חֹלִי הַפְּנִימִית שֶׁיֵּשׁ בַּמְשֻׁדֶּכֶת, אַךְ הֵם מַסְתִּירִים מֵהֶחָתָן, אֵין עַל הַמְגלֶּה חֲשַׁשׁ אִסוּר רְכִילוּת, אַךְ שֶׁלֹּא יַחְסְרוּ בָּזֶה הַפְּרָטִים הַנַּל (וּבֵאַרְתִּים בִּבאֵר מיִם חיִּים ס"קּ ח').
The same holds true for revealing to the groom the affairs of the father-in-law. That is, if he knows of an internal illness of the betrothed but they are concealing it from the groom, the revealer is not suspect of the issur of rechiluth (but the required conditions must be met).