They should not be able to put a notice on you just for being a relative, as Interpol is for individuals charged with crimes. However, they can use "Diffusions" to ask for info about family. Check
https://extraditionlawyers.net/ to see what your rights are regarding these inquiries. Sometimes they try to pressure family to get to the person they want. You should probably have a lawyer send a letter to clarify that you are not involved. It is a stressful situation, but usually, as long as you are not hiding him or helping with the crime, you should be okay. Just be careful what you say to them without a lawyer present. They are trying to build a map of his connections, and you do not want to become part of that map.
