And even though regarding sivlonot we do not fear for kiddushin, nevertheless, if he betrothed her with less than a perutah and afterwards had relations with her in the presence of witnesses of yichud—she requires a get, and so our Sages, of blessed memory, said [Ketubot 74a]: One who betrothes with a loan and had relations, on a condition and had relations, with less than the value of a perutah and had relations—she requires a get from him because a person does not make his relations relations of zanot and he intended and had relations for the sake of kiddushin, and therefore it is not similar to sivlonot. And from the wording of the Rambam at the end of chapter 7 it is implied that with less than the value of a perutah and with a loan it is certain kiddushin, and so it is implied from the wording of our teacher, the Beit Yosef, here in section 9 who wrote she requires a get because he certainly had relations for the sake of kiddushin, and according to this if another came and betrothed her she does not require a get from him, but many of the poskim hold that this is only a case of doubtful kiddushin and if another came and betrothed her she requires a get from both of them. And one must wonder about our teacher, the Beit Yosef, who in his book Kesef Mishneh there wrote that even according to the Rambam it is not certain kiddushin, and here he decided that it is certain kiddushin, and so he wrote in his great book, and even more so one must wonder about our teacher, the Rema, who wrote here: And the same law applies to a minor who betrothed and grew up with her, she requires a get because he certainly had relations when he grew up for the sake of kiddushin, thus far his words, and even though there are no witnesses to his yichud nor to his relations [the Gra] since they lived in the manner of a man and his wife it is like witnesses as is written in siman 26, and it will be further explained in siman 43, and above in siman 28 our teacher, the Rema, himself wrote in section 16 regarding less than the value of a perutah and he had relations that it is doubtful kiddushin, and here he compares this to a minor who grew up which is according to everyone certain kiddushin when they lived in the manner of a man and his wife. And for the halachah the acharonim decided regarding less than the value of a perutah and he had relations that it is doubtful kiddushin, and even if she was in yichud with him and we did not know that he had relations she requires a get, for we say the witnesses of yichud are themselves the witnesses of relations [Beit Shmuel]. And it seems to me to reconcile the words of our teachers the authors of the Shulchan Aruch that certainly in a case where he betrothed her with less than the value of a perutah and had relations one time by chance she requires a get due to doubt, and here it deals with one who betrothed her and had relations with her in the manner of a man and his wife, for in this it is simple that it is certain kiddushin since he knew that he betrothed her with less than the value of a perutah, and so it is implied from the words of our teacher, the Rema, who wrote: and specifically in such a case where every person knows that the kiddushin of a minor or with less than a perutah is nothing and therefore he had relations for the sake of kiddushin, but in a place where one might err she requires other kiddushin, thus far his words, and it was explained in the source of the law [in Teshuvot Maimoniyot] in a case of a certain man who had several sons from his wife and in the end it became known that the ring of kiddushin was not the value of a perutah, and they ruled that he must betroth her anew, for since he did not know that he required other kiddushin it did not enter his mind to betroth her through his relations. And the general rule of the matter—that any matter of kiddushin that are not kiddushin and he knew of this and had relations with her once, we say there is a presumption that a person does not make his relations relations of zanot and she requires a get. However, if another betrothed her—she requires a get from both of them, but if he lived with her in the manner of a man and his wife and the matter is public—it is certain kiddushin, and this is greater than the presumption that he does not make his relations relations of zanot, and all this is when he knew that they were not kiddushin but if he did not know at all of this in any case she requires other kiddushin, however if after it became known to him that it was not the value of a perutah he lived with her in the manner of a man with his wife and there were no witnesses of yichud—it can be said that it is like witnesses of yichud [Beit Shmuel], and there is one who is in doubt about this [ibid.], and one should follow the stringency. [And according to what I have written all that they questioned against the Beit Yosef and the Rema is settled, and see what I wrote in siman 28 section 70].
ואע"ג דבסבלונות אין חוששין לקדושין, מ"מ אם קדשה בפחות מפרוטה ואח"כ בא עליה בפני עידי יחוד – צריכה גט, וכך אמרו חז"ל [כתובות ע"ד.]: המקדש במלוה ובעל, על תנאי ובעל, בפחות מש"פ ובעל – צריכה הימנו גט משום דאין אדם עושה בעילתו בעילת זנות וגמר ובעל לשם קדושין, ולכן לא דמי לסבלונות. ומלשון הרמב"ם ספ"ז משמע דבפחות מש"פ ובמלוה הוה קדושי וודאי, וכן משמע מלשון רבינו הב"י כאן בסעי' ט' שכתב צריכה גט שוודאי בעיל לשם קדושין, ולפ"ז אם בא אחר וקידשה א"צ ממנו גט, אבל הרבה מהפוסקים ס"ל דזהו רק קדושי ספק ואם בא אחר וקדשה צריכה גט משניהם. ויש לתמוה על רבינו הב"י שבספרו כס"מ שם כתב דגם להרמב"ם לא הוה קדושי וודאי, ובכאן הכריע דהוה קדושי וודאי, וכ"כ בספרו הגדול, וביותר יש לתמוה על רבינו הרמ"א שכתב כאן: וה"ה קטן שקידש ונתגדל אצלה צריכה גט דוודאי בעיל כשהגדיל לשם קדושין עכ"ל, ואף שאין עדים לא ביחודו ולא בביאתו [הגר"א] כיון שדרו דרך איש ואשתו הוה כעדים כמ"ש בסי' כ"ו, ועוד יתבאר בסימן מ"ג, ולעיל בסי' כ"ח כתב רבינו הרמ"א בעצמו בסעי' ט"ז בפחות מש"פ ובעל דהוה ספק קדושין, ובכאן מדמה זה לקטן ונתגדל דזהו לכ"ע קדושי וודאי כשדרו כדרך איש ואשתו. ולדינא הכריעו האחרונים בפחות מש"פ ובעל דהוה קדושי ספק, ואפילו נתייחדה עמו ולא ידענו שבעל צריכה גט, דאמרינן הן הן עידי יחוד הן הן עידי ביאה [ב"ש]. ונ"ל לתרץ דברי רבותינו בעלי השו"ע דוודאי בקדשה בפחות מש"פ ובעל פעם אחת במקרה צריכה גט מספק, וכאן מיירי שקידשה ובא עליה כדרך איש ואשתו, דבזה פשיטא דהוה קדושי וודאי כיון שידע שקידשה בפחות מש"פ, וכן משמע מדברי רבינו הרמ"א שכתב ודווקא בכה"ג שכל אדם יודע דאין קדושי קטן או בפחות מפרוטה כלום ולכן בעל לשם קדושין, אבל במקום דאיכא למיטעי צריך קדושין אחרים עכ"ל, ונתבאר במקור הדין [בתשו' מיי'] במעשה באדם אחד שהיה לו מאשתו כמה בנים ולבסוף נודע שטבעת הקדושין לא היה ש"פ, ופסקו שצריך לקדשה מחדש, דכיון דלא ידע שצריך קדושין אחרים לא עלה בדעתו לקדשה בביאותיו. וכללו של דבר – דכל דבר קדושין שאינם קדושין והוא ידע מזה ובא עליה פעם אחת, אמרינן חזקה אין אדם עושה בעילתו בעילת זנות וצריכה גט. ומיהו אם קדשה אחר – צריכה גט משניהם, אבל אם דר עמה כדרך איש ואשתו והדבר מפורסם – הוה קדושין וודאים, וזהו למעלה מחזקה דאינו עושה בעילתו בעילת זנות, וכ"ז כשידע שאינם קדושין אבל לא ידע כלל מזה בכל עניין צריכה קדושין אחרים, מיהו אם אחר שנודע לו שלא היה ש"פ דר עמה כדרך איש עם אשתו ולא היה עידי יחוד – י"ל דהוי כעידי יחוד [ב"ש], ויש שמסתפק בזה [שם], ויש לילך לחומרא. [ולפמ"ש א"ש כל מה שהקשו על הב"י והרמ"א, ועמ"ש בסי' כ"ח סעי' ע'].