I shudder to think of the psychological effects of: a) Mom or Dad repeatedly touching their son's penis to do this; b) the pain associated with another person touching your penis; and c) Mom or Dad hurting you - repeatedly.
Your D-I-L didn't really think this through, did she?
You are correct. She didn't think any of it through. The marriage and all.
It was my daughter and she married into a different culture and he didn't believe in circumcision as he was not circumcised.