It's very normal for kids to get attached to one parent! Doesn't mean they'll never be bonded with the other.
Since I was 6 mo, my mom used to go out for work and I was raised by my grandparents. I used to spend most of the day with my grandparents. Even in the night, I refused to sleep with my parents.
Ultimately, I have equally strong bond with my parents as that of my grandparents.
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