I've posted about PIL before, bit of background - from reading other mn threads I think they are somewhat toxic, mil in particular. Fil is more of a doormat to her and does what he's told basically. She is controlling and because they live quite far away dp basically tolerates their visits then we don't have to see them again for a while. He does recognise the controlling behaviour, they have recently offered to give us a considerable sum of money but he's now refusing it as he knows it will come wth conditions.
Anyway! Point of posting- dp and I are getting married this year. PIL have always said they don't agree with marriage, they wouldn't have done it but felt pressured by their families. Let them know about the wedding when it was booked, no reaction to this or to receiving the invite in the post (dp rang to check they'd got it). No congrats etc. Tried to talk to them about it once and mil looked miserable and changed subject.
So yesterday dp is on the phone to fil and said 'we are probably going to get wedding rings this weekend "
Fil "oh right. Mil and I are getting new wedding rings, mil is getting rid of hers and we're going to get new ones. Not proper wedding rings though' dp then said fil made it sound like they are getting 'anti-wedding' rings.
Fwiw - fil currently doesn't wear a wedding ring. Mil does. Now they're getting rid of hers and getting new ones.
We're are getting married in less than 3 months (very small, family only less than 18 people wedding). Is this a bit odd?
So as not to drip feed; dp is feeling weird about this as am I. He's said maybe the only explanation could be that they're selling f hers to buy is ours. But this is unlikely 
