Radja's twin sister, Riana Nainggolan, just like her brother also plays for AS Roma's women football side as at the time of writing.
ເອື້ອຍຄູ່ແຝດຂອງນາງ Radja, Riana Nainggolan, ຄືກັນກັບອ້າຍຂອງນາງຍັງມີບົດບາດສໍາລັບແມ່ຍິງເຕະບານ AS Roma ໃນເວລາທີ່ຂຽນ.