The fact is that in Serbia exist the Royal House of Obrenovic and of course H.R.H. Prince Predrag Jakovljevic de Obrenovic as its first Head and the hereditary Prince
Who gave him the title?
During the reign of Obrenovic family, Jakovljevic family didn't have any titles.
Even descendants of Jevrem Obrenovic, full brother of Prince Milosh didn't held any titles prior to Serbia invited them to be rulers, despite being male line collateral branch of the family.
How can a female line relative of the family have titles if a male line relatives didn't have any titles during the reign of Milos,Milan and Michail???