Aqaaid

Will a person become a kaafir by jokingly saying "you can lie"

Q: I’d like to ask if the following constitutes kufr?

In the morning, I asked my brother that did you pray Fajr? He said yes. Then later in the morning he told me ‘ I only said yes to make you happy so you wouldn’t pester me’ Then I said ‘ you can’t lie (even for a joke)’ whereupon he said ‘why not?’

Did he commit kufr by saying jokingly ‘you can lie’? Then later he said he did actually pray Fajr but he ‘joked’ to me that he didn’t pray it.

Losing one's wedding ring

Q: I am a married Muslim woman. I have lost my ring which I got as a gift on my nikaah from my husband just like an engagement ring for which I am very upset but people around me told us that losing your nikaah ring isn't a good sign for married life.

I am very much tensed and I wish that this is just a rumor, nothing else. Please tell me about it in the light of islam.