We've been storing quite a few things in MILs loft due to lack of space. This included a Moses basket, crib, pram etc. We are now moving house so DP has been back and forth collecting things. MIL has refused to give back the baby-related items because BIL and partner are having a baby so she wants them in case it stays at her house. DP and I are trying for another baby, although she doesn't know this because she disapproves due to us already having one of each 
AIBU to demand our things back?