All Ahmadis would marry their children off before the age of 10 in the early days.  This is just another story.  Noorudin has to eventually annul the Nikkah.
pdf page 71/316
Narration 590

“Dr Mir M Ismail narrated to me that once hz khalifaI performed Nikah of his son Abdul hayye at a very young age with younger daughter (Hamida Begum) of Peer Manzoor Muhammed sb. Later on it was discovered that both kids were foster brother/sister (the were breast fed by same mother). Upon this, the matter was investigated thru jamaat’s Ulama that what quantity of breast feeding is considered for fostering (razaat) and in this situation fosetering is established or not…….Finally after investigation and debate, it was decided that both were foster brother/sister and Nikah was annulled.

Humble one states that as far as I remember, at that hz saheb (mgaq) was inclined that if small quantity of milk was shared, that should not be a cause of annulement of nikah and huzoor’s (mgaq’s) inclination was that Nikah would remain intact but Hz kahlifaI was careful on mater of Fiqah therfore hz saheb (mgaq) allowed the annullment. “