Intro
Mirza Bashir-ruddin Mahmud Ahmad was the golden boy of Mirza Ghulam Ahmad.  MGA didn’t care about any of his other sons, he made sure that Mahmud Ahmad got special treatment and grew up like a prince in Qadian.

The Highschool/middle school was started in Qadian in 1898, and Mahmud Ahmad entered as a student.  Mahmud Ahmad was married at the age of 11-12, he had lots of support from home, Noorudin worked around the clock to help him and other Ahmadi-mullahs would tutor him as needed.  Nonetheless, he was a terrible student as a matter of fact, he would go on to fail his matriculation examination at the age of 15 and was thus done with all studying by 1904-1905.

Adultery at the High school
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Translation
“”””(Seeratul Mahdi part Page 147)x
(153) chaudhry Hakim Ali stated to me that once during the life time of promised Messiah, it was suspected that some of students of khalifa Awwal Hakim Noor Din have committed adultery. The news reached Hazrat sb (MirZa Ghulam Qadiyani), who advised Molv i sb to send these accused students out side Qadiyan.

Moivi Noordin, sb recommended hazrat sb not to take action against them as only suspicion has been raised against them without any evidence. Hazrat sb said I am not imposing Shariat sentences upon them. Now when there are such rumours and suspicions better they may be thrown outside qadiyan as a precautionary measures.””””

Commentary on this quote
This is yet another controversial quotation from Seeratul-Mahdi, which seems to be the most controversial book in Ahmadiyya.  Mirza Bashir Ahmad seems to have wrote it at a time wherein Ahmadis were openly admitting to being bad people, however, since they were supported by the British Govt., they were thus above the law.  This quote proves that there young men were in and around Qadian committing adultery and etc.

Mahmud Ahmad’s famous immorality incident of 1906
Qadianis will never admit to this officially, however, the Lahori-Ahmadis have archived this event for us.  Mumutaz Ahmad Faruqi briefly mentioned it in his polemic vs. the Qadianis.  The name of the book is “Truth Triumphs”, it was published just a few months before Mahmud Ahmad passed away, this book caused so much of a stir that the Qadianis wrote an attempted refutation in 1966 feel free to read it here: https://alislam.org/library/books/truth_prevails/index.html

The Quote from Faruqi
Faruqi was very brief, however, here is the screen shot and reference finder: See page 40, http://www.aaiil.org/text/books/others/mumtazahmadfaruqui/truthtriumphs/truthtriumphs.pdf

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I found additional data in some old books on the life of Mahmud Ahmad
As i was researching Ahmadiyya in 2010, I came across some rare books on the life of Mahmud Ahmad from the 1940’s. Attached are the quotations from that book which seem to attempt to explain away the entire incident.

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What do these quotes tell us?
Mahmud Ahmad had some serious allegations against him in Qadian in 1906, he was harassing women and no one was brave enough to turn him in, however, eventually he was turned in.  MGA then ordered an inquiry commission to investigate these instances of immoral behavior.  Mahmud Ahmad was a married man, he didnt have children, however, he did have a wife, nonetheless, he sure acted like he was single and a Christian.  Co-incidentally, as Mahmud Ahmad grew up he would continue to live just as immoral, and with the protection of the British Govt.

Muhammad Ali, the Lahori-Ahmadi was also the investigative committee
Muhammad Ali knew that Mahmud Ahmad was guilty, in-fact, almost all the elders knew that he was guilty, however, the conviction of Mahmud Ahmad would be damaging to the entire mission of Ahmadiyya, so, they allowed him to walk free and blamed it on a lack of witnesses.  Interestingly enough, Muhammad Ali wrote a lengthy and positive review of Mahmud Ahmad and his newspaper, the Tashizazul Adhan.  Muhammad Ali seems to be a prisoner of consequence, and could never write ill of anyone from the Mirza family.

Some additional books that I am looking for
1—Qadiani Rasputeenoan kay ibratnaak anjaam by Mohammad Mateen Khalid
2—Mian Mahmud Ahmed Sahib kay unkay mureedain kay ilzamaat aur unsay bariyyat ka anokha tareeq by Maulana Mohammad Ali–the Lahori-Ahmadi

Conclusions
Ahmadis are totally corrupt, for the Mirza family, they are willing to lie all the way to the grave.