SIL has recently announced that she is getting married next october. My DH and his siblings don't have a relationship with their father. Because of this she hasn't got anyone to walk her down the isle. My MIL has just told me that SIL has decided DD is going to walk her down the isle. SIL absolutely adores DD and I do understand that, however she won't even be 2 at the date of the wedding and this makes me rather nervous. Is it unreasonable to think maybe she should've asked me instead of telling me?