How do you let you mum-in-law know that you will be calling the shots on the upbringing of your child (without sounding rude)?

I'd go through my partner at first and let him do the talking because it might be rude if I did it. My future MIL is not Asian so she has pretty strong opinions on certain things which does get unnerving at times. Usually, I let it slide but if it's something big like how to raise kids (I forsee this happening with me cos of culture, religion etc) I'd usually tell my partner to talk to his mom. He knows how to handle his mom and she'll probably listen to him more than me. Plus I imagine I'd get really emotional and mess up getting my views across, if I did it myself.