Im a first time mum and only left DD (10m) with MIL several times, and will be tomorrow.. DD a very happy chilled girl and Im totally fine leaving her with MIL as they see each other reguarly. SIL, despite being her godmother hasnt seen that much of her, and came to the door last month when i was in the bath and when DH answered DD was hysterical, this is totally out of character but something about SIL spooked her badly. 
Anyway tomorrow SIL said shed come by with my 2 nieces and nephew, but may arrive before im back as MIL will be here, I dont want her too as know that will freak DD out if im not here, DD not seen her kids since new year, I tried to say this to SIL in a roundabout way but she dismissed me a bit saying 'what will you be like when she goes to school' 'thats just kids' 'youve got to let her be for her own good' etc.. Basically quite a battle to try and get her to understand, while I ended up depricating myself 'oh what am i like' 'know its silly to be anxious' etc..
This annoyed me as SIL wouldnt even leave her kids with anyone, inc MIL, til about a year ago (oldest 10, youngest 3
) and is really precious about them. All her kids are rather clingy as a result.. Im annoyed on 2 counts, 1, she should respect my wishes specially as she is far worse about her DC, and 2, she has been really hypocritical, I would never of dreamt of questioning the way she has chosen to parent her kids..
Im sad as feel she is a great mum and has been otherwise really supportive to me, with good advice, however I know my DD and dont feel IBU by not wanting her to be unnecessarily distressed, and asking SIL to just come round 30mins later when im home too? She kind of agreed but not without totally dismissing my feelings and making me feel like an overprotective mum and making me think AIBU?