I just don’t get it

I’m in the kitchen baking Halloween cupcakes for family that will be popping in and the first thing I hear is my cousins wife tell her 1 year old son to shut up constantly yelling at him I’m thinking ever consider that he may not be feeling well and FYI he doesn’t understand that word makes me feel upset I feel like ppl who get easily frustrated at kids maybe them having kids maybe not be a good thing the other two kids she has are always pushed on my husband and me her being a parent is oh so exhausted she doesn’t really interact with them nothing what Can I do I feel bad for her kids