Firstly, I've namechanged as don't want to out myself incase any of the people involved are reading 
DP and I are getting married on Friday. DNephew (9) is page boy.
SIL rang this morning and left a voicemail on DP's phone to say that she thought she better warn us that today they are dying DNephew's hair bright green, as that is what he wants. She laughed at the end of the message saying 'sorry in advance about the wedding photos'.
I know she isn't joking. His hair has previously been all manner of colours - purple, pink, red etc.
So AIBU to ask DP to tell his sister that if his hair is bright green, I dont want him on my professional wedding photos? Or am I being a bridezilla?
If IABU, then please be gentle, I'm stressed enough already 