請問八老師，我兒子（13歲）有自閉症，語言非常有限，還有行為問題，感覺參加不了麵試，請問能不能為他申請免麵試，如何申請。非常感謝！
-Probably he may have to go for the interview and you need to go with him, and then explain it to IO (bring the doctor's diagnosis, if any). I don't think it is a problem.
There are some situations that the I-485 applicant can apply for interview waiver. See this USCIS's oplicy for interview waiver requirements to see whether your child meets one of them:
https://www.uscis.gov/policy-manual/volume-7-part-a-chapter-5#footnote-3
