My mother has no boundaries

Cassandra • 25. FTM.
Is anyone else dealing with their parents or in laws having no boundaries regarding your first, unborn child? My mom is super excited, but thinks she needs to tell my husband and I how to do everything, or what and whatnot to do. Ex: my grandson will not have long curly hair, and look like a girl. Lol silly. Another example is, My husband and I got onto the topic of doing our living will, in front of her. My husband and I have talked in the past about who we thought our son should go to, if God forbid something ever happened to us! I first said my parents ( my mom is 53 and dad is 58, right now) and he said, his sister/husband and two other children. My mom of course blurted out that she would want him... And I believe her, but what if something happened to us when they were in their 60's... Personally I wouldn't want them to worry about raising another child at their ages, at that time. She got all upset... I would just rather do the living will, and not bring it up with her again. But my husband on the other hand feels it needs to be addressed now, so there are no surprises.  I told him I won't be bringing it up to her right now (I'm 37w4d pregnant and emotional)... He said he will... What would you do? Bring it up? And how so... Or let hubby take care of it? I'm torn...