Hmm, I was thinking that there might be a problem with my crusader so I tried speaking to Nemma using my knight to initiate the quest and again, no response.
However, unlike my crusader, when my knight speak with Panno. She doesn't immediately ask me about redeeming lottery tickets.
3 option were given
1. Redeem lottery tickets
2. Temple Information
3. Hey, what's happening ?
My knight has completed the lost child quest.