MGA made many strange predictions about sons for his followers, in this case, he promised a son to some eager followers, but the prediction ailed miserably…see the summary below..

Seeratul Mahdi part 2 page 407-408.
(445) Mian Ghulam Nabi Sethi sb has stated to me that in the beginning, due to ATHRA ( Miscarriage), my wife had to face abortion. Hence I came to Qadiyan for the treatment of my wife by Hakim Molvi Nooruddin first kadiani Khalifa, The treatment started and meantime i kept requesting Hazrat Masih Moud for prayer in this regard.
One day when I was waiting for Hakim Noorudin in his clinic, he came and gave me good news. He said congratulation Mian Ghulam Nabi you need no more medical treatment as Hazrat sb has given you the good news of a son.
Then hakim sb told me that today Hazrat sb went to his garden along with Hazrat ummul momineen. Some of women including my wife and your’s were also accompanying with them.
Once in garden, Hazrat sb asked for “Shehtoot” (Mulberries). Few women went to take Shehtoot, your wife also went to pick mulberries to present to hazrat sb. These women picked all the mulberries they found but your wife climbed up the tree and picked some of the finest pieces of mulberries with her own hands.
When hazrat sb saw both kinds of mulberries, He asked as to why some of them are cleanest and other ones are slightly dirty. Hazrat Bivi Sahiba (Nusrat Jehan) begum told him that the cleaner ones have been picked up by wife of Mian Ghulam Nabi and rest by other women. She climbed up the tree and picked up each single piece with her own hands. Listening to this Hazrat sahib became pleased and prayed may Allah swt bless her with a boy.
Mian Ghulam Nabi sb states that after this prayer Allah swt blessed me with a boy but that boy died after attaining the age of 1 1/2 year.
He then goes on to say that hazrat sb sent a condolence letter to him and he got another boy afterward who remained alive .

The scans