Known egg donation is allowed in some countries, but regardless of whether you choose an anonymous or a known egg donor, the screening process will be exactly the same, including cases where the sister, cousin, aunt, sister-in-law, etc. becomes the egg donor.
You can find more information about intrafamilial egg donation here: Egg donation to a family member for IVF.
Read the full article on: What are the requirements for egg donation in Spain? ( 68).

Neus Ferrando Gilabert
B.Sc., M.Sc.
Bachelor's Degree in Biology from the University of Valencia (UV). Postgraduate Course in Biotechnology of Human Assisted Reproduction from the Miguel Hernández University of Elche (UMH). Experience managing Embryology and Andrology Labs at Centro Médico Manzanera (Logroño, Spain).