Family?

Okay so my husband is currently in the military. We met while he was stationed in Texas (where I'm from) we ended up getting married and he got stationed in maryland (where him and his whole family is from). We have been talking about starting a family (just wanting 2 or 3 at the most!) But his mom told us if we had kids she would be very mad. We are well off, have more than enough time for a baby and have A LOT of support from my family. I don't get it though because she said she would be excited if his brother and his wife had a baby? I'm trying to understand but it's very hard. So we're kinda scared of having a baby, but want one at the same time really bad.