Do most mother in laws always choose their son’s side over his wife’s?

I’m wondering because of a situation going on with my mom and dad. Even when I talk with my grandma she seems to always defend my dad saying that he’s tired and stuff when I asked her why didn’t she tell him to help me clean up the dog pee she told me that he was too fat to get up and worked too much I was like oh my God 😂 . It’s funny I didn’t realize this until now i’m so late. My grandma is a sweetheart and hilarious but damn she always is choosing his side even over me damn
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My grandma and my dad both saw this huge puddle of dog piss and didn’t help me they both just got up and walked away my poor boyfriend had to help me otherwise it would’ve taken hours 🤦‍♂️
Do most mother in laws always choose their son’s side over his wife’s?
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