Should I let my baby stay at my MIL's house?

Kate • Landscaper, Momma, Wife
My MIL is adamant about my son staying at her house. She has an entire nursery set up and everything. But she is a hoarder. She also has 4 cats and 2 dogs that are dirty as well. Here are some pics of their house. My husband doesn't see anything wrong with it and says I am over reacting and I just wondered what you all thought. 

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