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Parents that believe everything their child says or does, especially the younger one.
Dude, both of my parents are sucker parents, they believe everything my little sister does, if she's crying because she can't get her way, then when she gets her way, she quickly stops crying, that should tell you that she was just putting on a scene!

Your dad is such a sucker parent.

Mom! Only a sucker parent would believe that actually hurt him.
via giphy
by DDeeDD April 11, 2016
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