Intro
Dear readers, to full understand who Mirza Sultan Muhammad from Patti is, you have to do lots of reading, this is by no means an easy subject to learn.  Nonetheless, start here.  Mirza Sultan Muhammad married MGA’s daughter/niece and MGA also predicted his death within a few years, which never happened.  Ahmadi mullahs went to the extreme of making up fake stories that Mirza Sultan Muhammad repented or apologized, or in some way was neutral in this whole matter.  However, that is a total lie.  Firstly, Mirza Sultan Muhammad served in the British military and even fought during WW-1 (1914–1918).  He was shot and survived and became a hero of sorts.  In the below we sill present lots of info….pay attention.

Ahmadiyya sources lied and told us: these were taken from alislam.org, https://www.alislam.org/library/ahmadiyya-history/prophecy-muhammadi-begum-truth/

“I have always, and still consider the late Mirza Saheb, a righteous and respected person who was a servant of Islam; who had a noble spirit and who was constant in his remembrance of God. I entertain no opposition to his followers and regret that for certain reasons, I was not able to have the honour of meeting him during his lifetime.” [Tashizul Azhan: May 1913]
AND….

“At the time of the prophecy, the Arya Hindus, because of Lekh Ram and the Christians, because of Athim offered me a hundred thousand rupees to file a case against Mirza Saheb. If I had taken the amount I would have become rich but it was my great faith in him that prevented me from doing so.” 

“I declare on oath that I have such firm faith in Hazrat Mirza Saheb which I think even you, who profess to be his followers, cannot claim”
[Al Fazl: 9th June 1921]

We found the original scan of the Al-Fazl of June 9th, 1921

3 years later, Mirza Sultan Muhammad was tracked down and he clarified in the below

The weekly Ahl-i-hadith newspaper of 1924 tells us
Weekly Ahl e Hadis Amritsar in its publication of 24th March, 1924 brought an interesting report in this regard. Urdu version of which may be seen in screen shot of weekly. English translation is as under:-

“”“Mirza Sahib Qadiani ,s each prophesy proved to be a decisive one for him. Because he always prophesied for a decision from Allah. So his prophesy regarding his heavenly wed bride was clear in its meaning but the man to whom the lady was married, was Mirza Sultan Muhammad of Patti, District Lahore. It was all important that Mirza Sahib Qadiani pays attention to him because he was the main irritant in the acquisition of his prophesied bride. Therefore, a stern time line of the death of Mirza Sultan Muhammad was prophesied which was to expire in August 1894. But when he did not die in the given time line, Mirza Qadiani starts saying that my prophesy scared Mirza Sultan which earned him extension in life. Finally Mirza Sahib Qadiani wrote that he would be a liar, if Mirza Sultan did not die in my life time. Facts are that Mirza Sahib Qadiani died in 1908, but Mirza Sultan is still alive. During a debate at Sikandarabad, Qadiani Muballigh Abdur Rehman Desi Misri stated that Mirza Sultan had written a letter to Mirza Sahib Qadiani assuring him that he (Mirza Sultan) considers him a saintly person. Although this writing do not affect the prophesy in any manner, yet Mirza Sultan was asked of this, he verbally replied he has never been a believer of Mirza sb Qadiani. On request he wrote the following text:- When Mirza Qadiani announced my death prophesy I never thought it to be true nor I was scared of it. I have always been and am a follower of my elders of Islam to this day.”””

Signature 
Sultan Muhammad Baig Resident of Patti dated 30-03-1924.
Witnesses
Molvi Abdullah Imam Masjid Mubarak
Molvi Ahmadullah sb Amritsari 
Molvi Mola Bakhsh Khateeb Jama Masjid patti Distt Lahore.
Molvi Abdul Majeed Rasheed Resident of Patti.
Mistari Muhammad Hussain Naqsha Nawees Patti.

The scan

Molana Muhammad Hussain Batalvi has also confirmed from Mirza Sultan Muhammad thru one of his relative whether he has given Qadianis any such writing in their favour, he denied it