Gulam-Ahemedi literature is full of same filthy allegation of Jews i.e. Hz. Mariam had a biological father.
Their theory is in extreme contradiction with Quran. If their theory is right then Quran must be wrong or vise versa.
Gulam-Ahmediyat will never ever answer following question.
" Why Hz. Mariam (a.s.) was interrogated about her baby if she had a known man in her life in the community ? "
Quran tells us that she was interrogated and also tells us that she was a chaste woman.
Gulam-Ahmediyat theory is nothing but age old Jews allegations and anyone who accepts this theory has nothing to do with Islam.