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.
Suggested for you: Am I Eligible To Donate Eggs? – Requirements & Qualifications.